A train 100 m long moving at a speed of 50 km/hr crosses a train 120 m long coming from opposite direction on parallel tracks in 6 sec. the speed of the train was??

Solution (By Examveda Team)

The sum of lengths of the trains is the distance the second train travels.
100+120m =220m=0.22km
Let speed of second train be x km/h
They are in opposite directions.
effective speed = x+50 km/h

Time = 6 seconds = 6/3600 seconds => 1/600 hours
d=rt
0.22=(x+50)*1/600
multiply by 600
0.22*600 =x+50
132=x+50
x=132-50
x=82 km/h