Guns are fired at an interval of 21 minutes from a particular place. A man coming towards that place heard the sound at an interval of 20 minutes 15 seconds. If the speed of the sound is 360 metres per second, what is the speed of the man in kilometres per hour ? The snood
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Let the speed of the train be x m/sec. Then distance traveled by train in 10 min = Distance traveled by sound in 30 sec.
⇒x×10×60=330×30
⇒x=
10×60
330×30
=16.5
∴ Speed of the train =16.5 m/sec =16.5×
5
18
=59.4 km/hr.
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