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diff --git a/Fundamentals_of_Fluid_Mechanics/Ch_4.ipynb b/Fundamentals_of_Fluid_Mechanics/Ch_4.ipynb
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+{
+ "metadata": {
+  "name": "Ch 4"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 4:fluid kinematics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 4.6 Page no.165"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Example 4.6\n",
+      "#Determine how fast the manufacture must travell along the route.\n",
+      "#given\n",
+      "pratet=-8           #dollars/hr\n",
+      "pratex=0.2        #dollars/mi\n",
+      "\n",
+      "u=(-pratet)/pratex\n",
+      "\n",
+      "#Result\n",
+      "print \"The delivery speed=\",round(u,1),\"mi/hr\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The delivery speed= 40.0 mi/hr\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file