Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

Q: Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

Given Lengths = 140 m & 160 m Speeds = 60 km/h & 40 km/h (opposite) Compute Relative speed = (60 + 40) km/h = 100 km/h = 100 × (5/18) = 27.7778 m/sTotal distance = 140 + 160 = 300 mTime = 300 / 27.7778 = 10.8 s

Difficulty: Easy

9.6 s
10.8 s
11.2 s
12.0 s

Correct Answer: 10.8 s

Explanation:

Given

Lengths = 140 m & 160 m
Speeds = 60 km/h & 40 km/h (opposite)

Compute
Relative speed = (60 + 40) km/h = 100 km/h = 100 × (5/18) = 27.7778 m/sTotal distance = 140 + 160 = 300 mTime = 300 / 27.7778 = 10.8 s

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