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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, the length of the train is__ $m$ ?

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400

600

800

200

answer is D.

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Detailed Solution

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, the length of the train is

200 m

.
Let us consider the length of the train to be

x

Let the total distance covered by the train be

400 + x

We know that,

v = \frac{s}{t}

Here,

v = 30 m / s, s = 400 + x and t = 20 s

Now,
⇒

30 = \frac{400 + x}{20}

⇒

600 = 400 + x

⇒

x = 600 - 400

⇒

x = 200

The Length of the train is

200 m

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