A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevailing condition is 250ms ^-1, how much closer is the ship to the cliff?

10m

125m

175m

350m

1,000m

Correct answer is B

Difference in time = 1 sec.

echo time = 1 \(\div\) 2 = 0.5 sec.

= 0.5 x 250

= 125m

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A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevailing condition is 250ms -1, how much closer is the ship to the cliff?