A train traveling at 138 km/h completely crosses another train half its length and traveling in the opposite direction at 42 km/h in 6 s. If it also passes a railway platform in 45 s, then find the length of the platform. (In m)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 1525.
Relative speed = 138 + 42 = 180 km/h = 50 m/s
Let Train 1 length = L → Train 2 length = L/2
Total distance covered = L + L/2 = 1.5L
Length of train 1 = (50 × 6)/1.5 = 200 m
Length of platform = [42 × (5/18) × 45] - 200 = 1725 - 200 = 1525 m