SONAR

Q.

A ship sends out ultrasound that returns from the seabed and is detected after 5 s. If the speed of ultrasound through seawater is $1600m{s}^{-1}$, then what is the distance of the seabed from the ship?

1. 2.5 km

2. 3.5 km

3. 4 km

4. 5 km