Multiple choice

If the speed of the train be 80 kmph and it takes 6 seconds to pass a platform. Next it takes 5 seconds to pass a cyclist walking at the rate of 12 kmph in the same direction. What is the length of the platform? (in meter)

  1. 38.89

  2. 35.56

  3. 48.56

  4. 32.35
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct answer is A. When train passes platform: length of train + length of platform = (80 × 6/3.6) = 133.33 m. When train passes cyclist: relative speed = (80 - 12) = 68 kmph = 18.89 m/s. So length of train = 18.89 × 5 = 94.44 m. Therefore, platform length = 133.33 - 94.44 = 38.89 m.

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