Two trains travelling in the same direction at 40 km/h and 22 km/h cross each other completely in 1 minutes. If the length of the first train is 125 m, what is the length of the second train?
Given:
Speeds = 40km/h & 22 km/h
Length of 1 train = 125m
Time to pass one another = 1min = 60 seconds
Formula Used:
Relative speed for same direction = Difference of speeds
Solution:
Relative sped = 40 - 22 = 18km/h = 5m/s
Now,
Distance = 125 + L
Time = 60 seconds
Speed = 5m/s
So,
125 + L = 60 5 = 300
L = 300 - 125 = 175
Hence, the length of the second train is 175m.
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