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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:

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Question: 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

Answer: Option D

Explanation:

Let the speed of the second train be x km/hr.

Relative speed = (x + 50) km/hr
= (x + 50) x 5 m/sec
18
= 250 + 5x m/sec.
18

Distance covered = (108 + 112) = 220 m.

220 = 6
250 + 5x
18

250 + 5x = 660

x = 82 km/hr.