Question

Two trains 120 m & 80 m in length are running in opposite directions with velocities 42 km/hr & 30 km/hr . In what time will they completely cross each other.
(A) 10s
(B) 15s
(C) 20s
(D) 12s
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Answer 1

Answer:

The relative velocity in this case will be 42+30 as both the trains are running in opp direction. Also the distance needed to be traveled will be 120+80=200 m = 0.2 Km.

Answer 2

Answer:

10 sec

Step-by-step explanation:

Two trains 120 m and 80 m in length are running in opposite directions with velocities 42 km/hr and 30 km/hr. In what time they will completely cross each other? In 10 sec, the two trains will completely cross each other.

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