A SONAR station picks up a return signal after 3 seconds.How far away is the object?(Speed of sound in water is 1440 m/s).

distance = velocity* time/2

v = 1440m/s (in water)

t = 3 sec

so, d = 1440m/s*3s/2

       d = 4320m/2

       d = 2160m

so, the object is 2160m far from sonar station.

best of luck friend....