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30.A boy hears an echo of his 2 points own voice from a distant hillafter 4 s.The speed of soundin air is 350m/s. What is thedistance of the hill from theboy?​

Answer»

Explanation:

LET Distance between boy and hill = d metres

Total distance traveled by sound = 2d metres

SPEED of sound = 350 m/s

Distance = speed x time

2d = 350 x t

=> d = 175t metres

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