Answer:
SONAR
Step-by-step explanation:
SONAR = Sound Navigation and Ranging
This technique is used to find the position of other ship or we can use this to find the depth of the sea.
In this method sound waves are projected from the ship and then it gets reflected back from the solid surface.
This reflected wave is again detected by the detector on the ship and time is measured to get the wave back
So the distance moved by the sound waves is given by
so here we can say that distance moved by the sound is product of speed and time