Multiple choice

A train passes a platform 110 m long in 40 seconds and a boy standing on the platform in 30 seconds. The length of the train is

  1. 100m

  2. 110 m

  3. 220 m

  4. 330 m
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let train length be L and speed be v. L/v = 30 and (L+110)/v = 40. From first equation, v = L/30. Substituting: (L+110)/(L/30) = 40, so 30(L+110) = 40L, giving 30L + 3300 = 40L, so L = 330m.

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