A sonar device on a submarine sends out a signal and receives an echo 5s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

We know that, Speed = Distance / time
Time = 5s
Distance = 3625m
Total distance to be travelled by sound = 2 × 3625, as it is the distance taken by sonar wave to transmit and receive = 7250m
So, Speed = 7250 / 5 = 1450m/s