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A boy standing idle sounds a whistle to his friend at a distance of 1200 m moving away from him in a speeding car at 108 kms /hr. Find the duration after which his friend is going to hear him. (Speed of sound = 330m/sec).

a) 3.6 secs b) 4.00 secs c) 40 secs d) None of these

Read Solution (Total 1)

4 secs.

b) 4.00 secs

If friend hears sound after t secs, then

330*t = 1200 +(108*5/18)*t
300t =1200
t= 4 secs
12 years agoHelpfull: Yes(2) No(0)

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