two trains each of 120m in length,run in opposite directions with a velocity of 40m/s and 20m/s respectively how long will it take for the tail ends of the two trains to meet each other during the course of their journey
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Length of 1st and 2nd train = 120m
Velocity of first train = 20m/s .
Velocity of 2nd train = 40m/s.
Therefore , Total distance to cover = 120 × 2m = 240m.
USING RELATIVE VELOCITY :
Relative distance = 240m.
Relative velocity of 1st train with respect to second = ( 40 + 20 ) m/s = 60m/s.
Therefore time taken = (240m/60m/s) = 4s.
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