summaryrefslogtreecommitdiff
path: root/Quantitative_Aptitude_for_Competitive_Examinations/Chapter21.ipynb
diff options
context:
space:
mode:
authorhardythe12015-06-03 15:27:17 +0530
committerhardythe12015-06-03 15:27:17 +0530
commit47d7279a724246ef7aa0f5359cf417992ed04449 (patch)
treec613e5e4813d846d24d67f46507a6a69d1a42d87 /Quantitative_Aptitude_for_Competitive_Examinations/Chapter21.ipynb
parent435840cef00c596d9e608f9eb2d96f522ea8505a (diff)
downloadPython-Textbook-Companions-47d7279a724246ef7aa0f5359cf417992ed04449.tar.gz
Python-Textbook-Companions-47d7279a724246ef7aa0f5359cf417992ed04449.tar.bz2
Python-Textbook-Companions-47d7279a724246ef7aa0f5359cf417992ed04449.zip
add books
Diffstat (limited to 'Quantitative_Aptitude_for_Competitive_Examinations/Chapter21.ipynb')
-rwxr-xr-xQuantitative_Aptitude_for_Competitive_Examinations/Chapter21.ipynb399
1 files changed, 399 insertions, 0 deletions
diff --git a/Quantitative_Aptitude_for_Competitive_Examinations/Chapter21.ipynb b/Quantitative_Aptitude_for_Competitive_Examinations/Chapter21.ipynb
new file mode 100755
index 00000000..eaa1c595
--- /dev/null
+++ b/Quantitative_Aptitude_for_Competitive_Examinations/Chapter21.ipynb
@@ -0,0 +1,399 @@
+{
+ "cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "#21: Boats and Streams"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.1, Page number 21.3"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 1,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "rate in still water is 5.0 km/h\n",
+ "speed of current is 3.0 km/h\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "ds=8; #speed downstream(km/h)\n",
+ "us=2; #speed upstream(km/h)\n",
+ "\n",
+ "#Calculation\n",
+ "r=(ds+us)/2; #rate in still water(km/h)\n",
+ "s=(ds-us)/2; #speed of current(km/h)\n",
+ "\n",
+ "#Result\n",
+ "print \"rate in still water is\",r,\"km/h\"\n",
+ "print \"speed of current is\",s,\"km/h\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.2, Page number 21.3"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "speed of current is 1.0 km/h\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "ddn=30; #distance downstream(km)\n",
+ "dup=20; #distance upstream(km)\n",
+ "tdn=5; #time downstream(hrs)\n",
+ "tup=5; #time upstream(hrs)\n",
+ "\n",
+ "#Calculation\n",
+ "s=(1/2)*((ddn/tdn)-(dup/tup)); #speed of current(km/h)\n",
+ "\n",
+ "#Result\n",
+ "print \"speed of current is\",s,\"km/h\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.3, Page number 21.3"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 4,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "speed in still water is 7.0 km/hr\n",
+ "speed of current is 1.0 km/hr\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "d=2; #distance(km)\n",
+ "tdn=20; #time downstream(min)\n",
+ "tup=15; #time upstream(min)\n",
+ "\n",
+ "#Calculation\n",
+ "x=(d/2)*((1/tdn)+(1/tup)); #speed in still water(km/min)\n",
+ "x=x*60; #speed in still water(km/hr)\n",
+ "y=(d/2)*(-(1/tdn)+(1/tup)); #speed of current(km/min)\n",
+ "y=y*60; #speed of current(km/hr)\n",
+ "\n",
+ "#Result\n",
+ "print \"speed in still water is\",x,\"km/hr\"\n",
+ "print \"speed of current is\",y,\"km/hr\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.4, Page number 21.3"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 6,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "speed of stream is 1.3 km/h\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "r=4; #rate in still water(km/hr)\n",
+ "tdn=1; #assume\n",
+ "\n",
+ "#Calculation\n",
+ "tup=2*tdn; \n",
+ "d=(tdn+tup)/(tup-tdn);\n",
+ "s=r/d; #speed of stream(km/h)\n",
+ "\n",
+ "#Result\n",
+ "print \"speed of stream is\",round(s,1),\"km/h\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.5, Page number 21.4"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 7,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "distance is 8.0 km\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "x=6; #speed in still water(km/hr)\n",
+ "y=2; #speed of river(km/hr)\n",
+ "t=3; #time(hrs)\n",
+ "\n",
+ "#Calculation\n",
+ "d=t*(x+y)/(1+y); #distance(km)\n",
+ "\n",
+ "#Result\n",
+ "print \"distance is\",d,\"km\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.6, Page number 21.4"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 8,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "distance in downstream is 7.0 km\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "x=15; #speed in still water(km/hr)\n",
+ "y=13; #rate of current(km/hr)\n",
+ "t=15/60; #time(hrs)\n",
+ "\n",
+ "#Calculation\n",
+ "d=(x+y)*t; #distance in downstream(km) \n",
+ "\n",
+ "#Result\n",
+ "print \"distance in downstream is\",d,\"km\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.7, Page number 21.4"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 9,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "average speed for total journey is 4.0 km/h\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "x=4.5; #speed in still water(km/hr)\n",
+ "y=1.5; #rate of current(km/hr)\n",
+ "\n",
+ "#Calculation\n",
+ "avgs=(x+y)*(x-y)/x; #average speed for total journey(km/h)\n",
+ "\n",
+ "#Result\n",
+ "print \"average speed for total journey is\",avgs,\"km/h\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.8, Page number 21.4"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 16,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "speed of rowing in still water is 22\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "T=55; #time(min)\n",
+ "c=60; #conversion factor from min to h\n",
+ "y=2; #speed of stream(km/h)\n",
+ "d=10; #distance upstream(km)\n",
+ "\n",
+ "#Calculation\n",
+ "a=T/5; #coefficient of x**2\n",
+ "b=-c*y**2; #coefficient of x\n",
+ "c=-a*y**2; #constant\n",
+ "x=(b**2)-(4*a*c);\n",
+ "x1=-b+math.sqrt(x)/(2*a);\n",
+ "x2=-b-math.sqrt(x)/(2*a);\n",
+ "\n",
+ "#Result\n",
+ "print \"speed of rowing in still water is\",int(x2/10)"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "##Example number 21.9, Page number 21.4"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 17,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "flow of river is 3.0 km/h\n"
+ ]
+ }
+ ],
+ "source": [
+ "#importing modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "s=10; #speed in still water(km/h)\n",
+ "td=91; #total distance(km)\n",
+ "t=20; #time(h)\n",
+ "\n",
+ "#Calculation\n",
+ "d=t/s; #distance(km)\n",
+ "y2=(s**2)-td; \n",
+ "y=math.sqrt(y2); #flow of river(km/h)\n",
+ "\n",
+ "#Result\n",
+ "print \"flow of river is\",y,\"km/h\""
+ ]
+ }
+ ],
+ "metadata": {
+ "kernelspec": {
+ "display_name": "Python 2",
+ "language": "python",
+ "name": "python2"
+ },
+ "language_info": {
+ "codemirror_mode": {
+ "name": "ipython",
+ "version": 2
+ },
+ "file_extension": ".py",
+ "mimetype": "text/x-python",
+ "name": "python",
+ "nbconvert_exporter": "python",
+ "pygments_lexer": "ipython2",
+ "version": "2.7.9"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
generated by cgit (git 2.34.1) at 2024-12-20 22:34:09 +0000