Mon January 31, 2011 By: Arif Raza

two guns were fired from the same place at an interval of 13 minutes but a person in a train approaching the place hears the second report 12mins 30 seconds after the first. find the speed of the train supposing that sound travels at 330 m/s

Expert Reply
Fri February 11, 2011
Dear student,
Sound travels at 330m/s speed.
Distance traveled by train in 12min and 30sec(750sec) = Distance traveled by sound in 30sec = 30 * 330 m
Speed of train = 30*330/750 = 66/5 m/sec = 1188/25 km/hr = 47.52 km/hr
We hope that clarifies your query.
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