A train running at 75 km/hr crosses another train running at 30 km/hr in the same direction in 108 seconds. If the length of the fast-moving train is 950 m, then what is the length (in m) of the slow-moving train?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 400.
Relative speed = 75 − 30 = 45 km/hr = (45 × 1000) / 3600 = 12.5 m/s
Time = 108 sec
Distance covered = Relative speed × Time = 12.5 × 108 = 1350 m
Length of fast train = 950 m
So, length of slow train = 1350 − 950 = 400 m