Question

A 150 meter long train travelling at a speed of 90 km/hr,will take how many seconds to cross a bridge of 200 meter length?

Answer 1

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Given,
length of the train = 150 mts
Speed of the train = 90 kmph

Length of the Bridge = 200 mts
Time taken by train to cross the Bridge= ?



--- Convert Speed of Train given in kmph to mps

$1\: kmph = \frac{5}{18}\: mps$

$\implies 90\: kmph = 90× \frac{5}{18}\: mps = 25\: mps$



--- Find Distance Covered by train

Distance Covered by train = Length of train + Length of Bridge
$\implies Distance\: Covered = 100 + 250 = 350\: mts$



--- Find time taken by train to Cross the bridge

$time\: taken =\frac{Distance\: Covered}{Speed}$

$\implies time\: taken = \frac{350}{25} = 14\: s$



Therefore,
The train takes 14 seconds to cross the bridge

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