it 220 M long Railway with crosses another 180 metre long train running in the opposite direction in 8 seconds if the speed of this longer train is 40 m per second the speed of the Other shorter train in metre per second is
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length of both trains is 400 m=(180+220) since travelling in opposite direction
time taken to cross each other is 8 sec
distance covered in 1 sec=400/8=50 i.e effective speed of both trains is 50 m/s.
speed of lower train is =effective speed-speed of other train=50-40=100 m/s.
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