Question

Guns are fired from a city at intervals of 10 minutes and a train was approaching the city with a speed of 72 km/h.If sounds travel 400 metres per second at what interval of time the passenger of the train hears two successive sounds?

Answer 1

Difference of time = 6 min-5 mins. 52 secs = 8 secs.

Distance covered by man in 5 mins. 52 secs = distance covered by sound in 8 secs

= 330*8 = 2640 m.

Hence, speed of man

= 2640/5 min. 52 secs;

= 2640m/352 secs

= 2640 * 18/352 * 5 kmph

= 27 kmph.

Answer 2

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