A soldier walks towards a high wall making 120 steps per minute. When he is at a distance of 85 m fr

Question

A soldier walks towards a high wall making 120 steps per minute. When he is at a distance of 85 m from the wall he observes that the echo of a step coincides with the next step. The speed of the sound is\

Professor PC Thomas Classes · Answer

$2 \mathrm{~d}=\mathrm{vt}$\ $v=\frac{2 d}{t}$\ $\mathrm{d}=85 \mathrm{~m}$\ $\mathrm{t}=$ interval between two steps $=\frac{60 \mathrm{~s}}{120}$\ Substitute and get the answer.\