Question

A boy stands 85m in front of a high wall and blows a whistle. Calculate the
time (speed of sound = 340 m/s).

Answer 1

distance between boy and wall is 85 m

speed of sound in that surroundings is 340 m/s.

time taken = 2×distance/speed

=170/340

=0.5 second

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Answer 2

┏─━─━─━─━∞◆∞━─━─━─━─┓ ✭✮ӇЄƦЄ ƖƧ ƳƠƲƦ ƛƝƧƜЄƦ✮✭ ┗─━─━─━─━∞◆∞━─━─━─━─┛

➧ d ➾ 85 m
➧ v ➾ 340 m/s
➧ t ➾ ?

❱ v = 2d / t

340 = 2 × 85 / t
   t = 2 × 85 / 340
    ➾ 0.5 sec ...✔

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