Q

A student shouts facing a tall building 176 meters away and hears the echo after 1 second. What is the speed of sound in air based on this observation?

RRB Group D 12 Aug, 2026 (4:30 PM - 6:00 PM) 2026
✓ Answer: D 352 m/s
The sound travels 2×176 = 352 m in the round trip. Therefore speed = 352/1 = 352 m/s.
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