A boy standing between two cliffs claps and hears 2 echoes after 1s and 1.5s respectively . If the velocity of sound is 350m/s, find the distance between 2 cliffs.

Let A and B are the two cliffs.

M is the position of the man.

Let the distance between cliff A and man be x.

Let the distance between cliff B and man be y.

x = speed x time

x = 350 x (1/2) = 175 m

y = 350 x (1.5/2) = 262.5 m

Distance between the cliffs = x + y = 437.5 m

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