A train 100 m long is moving at a speed of 50 km/hr crosses a train 120 m long coming from opposite direction in 6 seconds. The speed of second train is :
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A train 100 m long is moving at a speed of 50 km/hr crosses a train 120 m long coming from opposite direction in 6 seconds. The speed of second train is :
A. 45 km/h
B. 132 km/h
C. 63 km/h
D. 82 km/hAnswer: Option D
Explanation:
Let the Speed of second train = x km/h
Relative speed = (50 + x ) km/h
Total Distance covered= (100 m + 120 m) = 220 m = 0.22 km
Time = 6 sec = 6/ (60 x 60) hr =1/600 hr
Now, Speed = Distance/ Time
(50 + x ) =0.22 / (1/600)
50 + x =132
x = 82 km/hHence, Speed of second train =x km/h = 82 km/h
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