Question

A man standing beside a river sees a gun
being fired on the other side of the river. He
hears the sound 0.3 s after he sees the smoke.
What is the width of the river? The velocity
of sound in air = 332 m/s.
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Answer 1

Given: Time = 0.3 sec

Velocity of air = 332 m/s

To find: Width of river

Step 1: Speed = Distance/Time

=> 332 = Distance/0.3

=> Distance = 99.6 m

Width of river = Distance travelled by bullet= 99.6m

Hence, Width of river is 99.6m