Two trains 120 m and 80 m in length are running in opposite direction with velocities 42 km/hr and 30 km/hr. In what time they will complete cross each other?
Relative velocity of one train w.r.t second,
= 42 - (-30)
= 72 km /hr
= 20 m/s
Total distance to be travelled = 120 + 80 = 200 m
Time taken = 200/20 = 10 sec
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