Question

A
manbeats drum at a certain distance from the mountain. He slowly increases the rate of beating and
finds that the echo is not heard distinctly, when the drum beating is at the rate of 40 per minute. He moves by
80 m towards the mountain and finds that the acho is again not heard distinctly when the rate of
g of the drum is 1 per second. What is the original distance of the man from the mountain?
Please help......​

Answer 1

Answer:

The echo is not heard distinctly when the echo and the next beat fall on the ear simultaneously, i.e., time per beat = time taken by the reflected beat to reach the man Hence, 2d/v = 60/40 = 3/2 and 2(d-80)/ v = 1 which gives d = 240 mRead more on Sarthaks.com - https://www.sarthaks.com/197142/man-beats-drum-at-certain-distance-from-a-mountain-he-slowly-increases-the-rate-of-beating

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