TISSNET 2021

Question 46

Two guns were fired from the same place at an interval of 6 minutes. A person approaching the place observed that 5 min 52 seconds have elapsed between the hearings of the sound of two guns. If the velocity of the sound is 330 meter/ second,the man was approaching that place at what speed in kilometer per hour?

Solution

Two shots were fired at an interval of 6 minutes, but the man heard both shots at an interval of 5 minutes 52 seconds which means that between the hearing of the first shot and the second shot, he covered a distance equal to 330*8 m.

Time taken by man to cover the distance = 352 seconds

Speed of man = (330*8)/352 = 7.5 m/s

Speed in Km/hr = 7.5 * (18/5) = 27 Km/hr


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