Question

a man standing in front of an hill produces a sound and hears it echo after 4.5 second. he then moves 250m towards the hill and produces the same sound. it echo is heard after 3.1 second. find the original distance of men from the hill and velocity of sound.
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Answer 1

Answer:

let the original distance be x

produce sound from x m and hear it in 4.5 second

then man moves toward 250 m

distance = x-250 m

produce sound from x-250m and hear it in 3.1 second

x-250=3.5

x= 3.5 +250

x= 253.5