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A man standing in front of mountain at a certain distance beats a drum at regular intervals. The drumming rate is gradually increased and he finds the echo is not heard distinctly when the rate becomes 40/min. He then moves nearer to the mountain by 90 m and finds that the echo is again not heard when the drumming rate becomes 60/min. Calculate (a) the distance between the mountain and the initial position of the man and the mountain and (b) the velocity of sound. |
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