Train speed

The troop fired two guns from the same place at 10 minutes and 30 seconds intervals, but a person on a train approaching the place heard a 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 answer:

v =  61.2 km/h

Step-by-step explanation:

t1=(10+6030)/60=407=0.175 h t2=10/60=610.1667 h  t=t1t2=40761=1202112020=1202120=12010.0083 h v1=340 3.6=1224 km/h   t v1 = t2   v  v=v1 t2t=1224 611201=5306 km/h=61.2 km/h

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