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ICSE Class 8 Answered

A man is Firing a gun at a terrain distance from a hill. He heart a echo after 4.6 sec. He come classes by 300m. Now he heard the echo after 2.4sec. what will be the distance initially
Asked by biswanilkhan99 | 14 Feb, 2018, 08:39: AM
answered-by-expert Expert Answer
Let d be the initial distance between the given location and hill. 
 
echo heard after 4.6 s means, velocity of sound v = (2d) / 4.6 = d / 2.3 ;
 
in second case velocity of sound v = 2(d-300) / 2.4 = (d-300) / 1.2 ;
 
hence begin mathsize 12px style v space equals space fraction numerator d over denominator 2.3 end fraction space equals space fraction numerator d minus 300 over denominator 1.2 end fraction end style
solving for d, we will get d = 627 m
Answered by Thiyagarajan K | 14 Feb, 2018, 12:42: PM

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