A boy hears the echo of his own voice from a distance hill after 0.8 seconds. If the speed of sound in air is 340m/s, calculate the distance of the hill from the boy.

the distance is going be 136 since velocity of sound waves =to 2* the distance(meter) all time taken(in second)

The required distance = 340 × 0.8 m.

= 272m

Explanation:

So the only thing you need here is :

distance = speed × time

So the speed of the wave here is 340m/s.

Time taken = 0.8s

So, By using the speed-distance formula here,

The required distance = 340 × 0.8 m.

= 272m.

car a and b are moving in opposite directions

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