Question

A man standing between two hills he fires a gun he hears two echos one after 0.3 seconds and another after 0.5 seconds find the distance between two hills

Answer 1

Answer:

Suppose the two cliffs are A and B which are at the distances x and y from the man respectively.

Consider that the echo of 1.5 sec and 2.5 sec are produced by are produced by cliff A and B.

2x = 340 x 1.5

x = 255 m

2y = 340 x 2.5

y = 425 m

Distance between the cliff = x + y = 680 m

The third echo will be heard after 1.5 sec from the time when the second echo is heard.

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Answer 2

The speed of sound = 340 m/s
Distance=speed×time
1 St wall's distance from man = 340×0.3
=102 meters
2nd walls distance from man = 340×0.5
=170 meters
The distance between the two walls = 170 meters - 102 meters = 68 meters