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ICSE Class 10 Answered

A man standing in front of a wall produces a sound and hears an echo after 3s. He walks ‘x’ m away from the wall and produces the same sound. Now he hears an echo after 5.25s. Calculate the distance he walked away from the wall. (Speed of sound in air is 340 m/s)
Asked by Manju | 15 Mar, 2018, 06:31: PM
answered-by-expert Expert Answer
Let d be the distance initially from the man to wall.
 
then, 2×d = 340×3 ; we get d = 510 m
 
now he moves away by x metre. Let D be the new distance
 
then 2×D = 340×5.25; we get D = 892.5 m
 
hence he moved (892.5-510) = 382.5 m away
Answered by Thiyagarajan K | 15 Mar, 2018, 09:25: PM

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