A train passes over a $400 m$ long bridge. If the speed of the train is $30 m / s$ and the train takes $20 s$ to cross the bridge, find the length of the train.

400 m

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600 m

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800 m

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200 m

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Solution

The correct option is D $200 m$
The total distance covered by the train in crossing the bridge is $400 + L m$

And we know that $d i s t a n c e = s p e e d \times t i m e$

So, $400 + L = 600 \Rightarrow L = 200 m$

where L is the length of the train

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A train passes over a 400m long bridge. If the speed of the train is 30m/s and the train takes 20s to cross the bridge, find the length of the train.

The correct option is D 200mThe total distance covered by the train in crossing the bridge is 400+LmAnd we know that distance=speed×timeSo, 400+L=600⇒L=200mwhere L is the length of the train

A train passes over a $400 m$ long bridge. If the speed of the train is $30 m / s$ and the train takes $20 s$ to cross the bridge, find the length of the train.

The correct option is D $200 m$
The total distance covered by the train in crossing the bridge is $400 + L m$

And we know that $d i s t a n c e = s p e e d \times t i m e$

So, $400 + L = 600 \Rightarrow L = 200 m$

where L is the length of the train