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?
echo of the sound = 2 times of the original sound
0.2sec = 2x
x = 0.1 sec
speed = $$\frac{distance}{speed}$$
  0.1 = $$\frac{distance}{342}$$
distance = 34.2 m
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