railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Wave

The echo of the sound of a boy standing in front of a mountain is heard after 0.2 s. What is the distance of the mountain from the boy when speed of the sound is 342 m/s?

1
34.2 m
2
68.4 m
3
68.8 m
4
34.4 m
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