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A train crosses bridge A in 15 seconds and bridge B in 30 seconds. If the length of the train is 200 m and the length of bridge B is twice the length of the train then the length of bridge A? 


1. 200 m
2. 150 m
3. 100 m
4. 400 m
5. 350 m

1 Answer

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Best answer
Correct Answer - Option 3 : 100 m

Given :

Length of train = LT = 200 m

Length of bridge B = LB = 400 m

Calculations:

Let the speed of train = ST

And Length of bridge A = LA

Formula used :

Speed of train = (length of train + length of bridge) /time taken

ST  = (LT + LA )/15      ----(1)

Also , ST = (LT + LB )/30      ----(2)

On equating equation (1) and (2) we get

⇒ (LT + LA )/15 = (LT + LB )/30

⇒ (200 + LA)/15 = (200 + 400)/30

⇒ LA = 100 m

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