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, then the length of the train is

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
Let the length of the train be $L$ .
Total distance cover by the engine to cross the bridge $d = 400 + L$
Speed of train $v = 30 m / s$
Time taken $t = 20 s$
Using $d = v t$
or $400 + L = 30 \times 20$
$⟹ L = 200 m$

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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, then the length of the train is

The correct option is D 200 mLet the length of the train be L.Total distance cover by the engine to cross the bridge d=400+LSpeed of train v=30 m/sTime taken t=20 sUsing d=vtor 400+L=30×20⟹ L=200 m

The correct option is D 200 m
Let the length of the train be $L$ .
Total distance cover by the engine to cross the bridge $d = 400 + L$
Speed of train $v = 30 m / s$
Time taken $t = 20 s$
Using $d = v t$
or $400 + L = 30 \times 20$
$⟹ L = 200 m$