Multiple choice

A train passes two bridges of lengths 800 m and 400 m in 100 seconds and 60 seconds respectively. The length of the train is :

  1. 80m

  2. 90m

  3. 200m

  4. 150m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let train length = L, speed = v. For 800m bridge: (L + 800)/v = 100. For 400m bridge: (L + 400)/v = 60. Dividing: (L + 800)/(L + 400) = 100/60 = 5/3. 3(L + 800) = 5(L + 400). 3L + 2400 = 5L + 2000. 400 = 2L, L = 200m. Option C is correct.

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