A ship travelling towards a cliff receives the echo of its whistle receives the echo of its whistle after 3.5 seconds. If the speed of sound in air under th...

A ship travelling towards a cliff receives the echo of its whistle receives the echo of its whistle after 3.5 seconds. If the speed of sound in air under the prevailing conditions is 250ms ${}^{-1}$, how much closer is the ship to the cliff? 

Answer Details

Difference in time = 1 sec

Echo time = 1  $÷$/ 2 = 0.5 sec

Difference of cliff from ship = 0.5 x 250

= 125m