Question
Two guns were fired from the same place at an interval of 10 minutes and 30 seconds but a person in he train approaching the place hears the second shot 10 minutes after the first . The speed of he train (in km/hr) supposing that speed travels at 330 metres per second is :
Answer: Option C
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Let the speed of the train be `x` m/sec. Then
Distance travelled by the train in 10 min. = Distance travelled by sound in 30 sec.
`hArr x ` x 10 x 60 = 330 x 30 `hArr x` = 16.5
`:.` Speed of the train = 16.5m/sec = `(16.5 xx 18/5)` km/hr = 59.4 km/hr
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