Question

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Answer 1

750 m is the answer

Let the speed of sound be s

And the speed of sound is same for both events...

By which we can say that

2l /t = s

Where l is distance between cliff and source and t is the time of echo...

So, the first case will be

2l/4 = s

And second case will be

2l-150/3.6 = s

Equating both equation

2l/4=2l -150/3.6

7.2l = 8l - 600

600 = 0.8l

hence l = 750m

Hope it helped

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