Answers

2015-05-21T14:01:01+05:30
We know that speed = distance / time
given
d=?
s=1531m/s
now half of 3.42 that is:
3.42/2=1.71\
so (time) t=1.71s

therefore

distance =speed * time 
d=s*t
d=1531*1.71
d=2.618.01
d=2.6 km
0
2015-05-21T14:40:01+05:30

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Distance =  speed  *  time duration
             =  1, 531 * 3.42 =  5, 236.02 meters


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click on thanks button above
but the distance is asked from the boat to the sea bed .. would u clarify this to me.
speed given is that of ultrasonic sound in sea water. The distance travelled by the wave is twice the depth of sea water, as sound travels down and again up. So distance = 1,531 * 3.42 /2 = 2, 618.01 meters or 2.618 km.
sorry for the error