A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is:
A.48 km/hr
B.54 km/hr
C. 66 km/hr
D.82 km/hr
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Answer: 82 km/hr
descripition: the total distance = 108+112=220
time=6 seconds
relative speed=distance/time =220/6 m/s =110/3 m/s
={110/3} x {18/5} km/hr
50 + speed of second train 132 km/hr
speed of second train = 130-5 = 82km/hr
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