An echo is heard 5 seconds after a sound is produced, with sound travelling at 340 m/s. What is the distance to the reflecting mountain?

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1. An echo is heard 5 seconds after a sound is produced, with sound travelling at 340 m/s. What is the distance to the reflecting mountain?

0.085 km

0.85 km

1.7 km

0.17 km

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Round-trip distance equals speed multiplied by time: 340 × 5 = 1,700 metres. Distance to the mountain is half of that, one-way: 850 metres, which equals 0.85 km.