Two trains of length 180m and 260m are moving on parallel tracks. If they move in the same direction then they cross each other in 15 sec,and if they move in opposite direction then they cross in 15/2 sec,then calculate their velocities.
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Explanation:
You need to use the concept of relative velocity here. 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.
Time = Distance/Speed = 0.2/72 = 0.0027 Hr = 10 Seconds
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