Q

A boy claps near a rock and hears an echo after 3 s. At sound speed 346 m/s, what is the distance to the rock?

RRB Group-D 11/12/2018 (Shift-II) 2018
✓ Answer: B 519 m
d = vt/2 = 346 × 3/2 = 519 m.
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