Multiple choice

Two trains are running in the same direction at the speed of 50 km./hr. and 30 km./hr. respectively. The faster train crosses a man in the slower train in 18 seconds. What is the length of the faster train ?

  1. 0.1 km.

  2. 1 km.

  3. 1.5 km.

  4. 1.4 km.

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Relative speed = 50 - 30 = 20 km/hr = 20 × 5/18 = 50/9 m/s. Distance (length of faster train) = Relative speed × Time = (50/9) × 18 = 100 meters = 0.1 km. Option A is correct. The other options are too large.

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