An object is 11 km below sea level. A research vessel series down a sonar signal to confirm this depth.After how long can it expect to get the echo? (Speed of sound in sea water as 1540 m/s)

it is taken as 1600 m/s
s = 2d/t since sonar has to hit surface and bounce back.
1540/11=ur answer
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the signal has to reach the object and then travel back
hence, the distance is 2*d
therefore,
v=(2*d)/t
1540=(2*11000)/t
t=22000/1540
therefore the time is 14.28 sec
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