Multiple choice

A train running at a speed of 60 km./ hr. crosses a platform doubles its length in 34.2 seconds. What is the length of the platform?

  1. 380 m.

  2. 360 m.

  3. 350 m.

  4. 340 m.

  5. 330 m.
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A Correct answer
Explanation

Train speed = 60 km/hr = 60 × 5/18 = 50/3 m/s. If train length is L, platform is 2L, total distance = 3L. Distance = Speed × Time, so 3L = (50/3) × 34.2 = 50 × 11.4 = 570m. Thus L = 190m and platform = 2L = 380m. The train must travel its own length plus the platform length to cross completely.

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