two trains 90m and 120m in length are running in opposite directions on a parallel tracks with velocities 72km/h and 36km/h in what time they will completely cross each other
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Train A is 90 m long and running at 72 km/h.
Train B is 120 m long and running at 36 km/h.
When the trains are running in opposite directions, their relative speed gets added: 72+36 = 108 km/h. = 30m/s
The total length of A and B = 90+120 = 210 m
So the time taken to cross each other = 210 / 30 = 7
= 7 seconds
they will cross completely in 7 seconds.
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