// chapter 1 , Example1 1 , pg 20
v=1440      //velocity of ultrasonic waves(in m/s)
t=0.33      //time lapsed(in sec)
d=(v*t)     //distance travelled by ultrasonic waves
d1=d/2      //depth of submarine
disp (d, ' the velocity of ultrasonic waves ( in m) is ' )
disp (d1, ' the depth of submarine ( in m) is ' )