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Explanation
Two trains of equal length are running on parallel lines in the same direction so average velocity will be calculated by subtracting 36 from 46 km/h.
To calculate the length (supposing y, then total length = y + y = 2y) we can use speed distance time formula;
Length (distance) = speed x time
To Find
Length of the train = ?
Solution
Relative speed = 46 – 36 = 10 km/h
This speed in m/sec will be;
Relative speed = (10 x 1000)/3600 = 25/9 m/sec
As, there are two trains, so total length = y + y = 2y (Let suppose length of train is “y”)
Now,
length = speed x time
2y = (25 x 36)/9
2y = 100
y = 50m answer
Conclusion
Two trains of equal length are running on parallel lines in the same direction at 46 km/h and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train will be 50m.
