Train speed

Two guns were fired from the same place at an interval of 10 minutes and 30 seconds, but a person in a train approaching the place hears second shot 10 minutes after the first. The speed of the train (in km/hr), supposing that sound travels at 340 m/s is:

Correct result:

v =  61.2 km/h

Solution:

t1=(10+3060)/60=740=0.175 h t2=10/60=160.1667 h  t=t1t2=0.1750.1667=11200.0083 h v1=340 3.6=1224 km/h  t v1=t2 v  v=v1 tt2=1224 0.00830.1667=3065=3065 km/h=61.2 km/h



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