Q

A student shouts facing a building 220 meters away. If the speed of sound is 330 m/s, how long after the shout will the echo be heard?

RRB Group D 18 Aug, 2026 (4:30 PM - 6:00 PM) 2026
✓ Answer: D 1.33 s
The sound travels to the building and back, so distance = 2×220 = 440 m. Time = 440/330 ≈ 1.33 s.
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