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+// 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 ' )
+