A train passes two bridges of lengths 800 m and 400 m in 100 seconds a

1.	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 (a) 80 m (b) 90 m (c) 200 m (d) 150 m
Answer» (c) 200 metres Let the length of the train be x metres. Then, \(\frac{800+x}{100} = \frac{400+x}{60}\) ⇒ 2400 + 3\(x\) = 2000 + 5\(x\) ⇒ \(x\) = 200 metres.

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 (a) 80 m (b) 90 m (c) 200 m (d) 150 m

Answer»

(c) 200 metres

Let the length of the train be x metres.

Then, \(\frac{800+x}{100} = \frac{400+x}{60}\)

⇒ 2400 + 3\(x\) = 2000 + 5\(x\)

⇒ \(x\) = 200 metres.

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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 (a) 80 m (b) 90 m (c) 200 m (d) 150 m

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