A 150 ,m long train is moving with a uniform velocity of 45 ,km/h . time taken by train to cross a b

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2.Motion in Straight Line

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A $150 \,m$ long train is moving with a uniform velocity of $45 \,km/h$. The time taken by the train to cross a bridge of length $850 $ meters is..........$sec$

A

$56$

B

$68$

C

$80 $

D

$92$

Solution

(c) Total distance to be covered for crossing the bridge $=$ length of train $+$ length of bridge

$ = 150m + 850m = 1000m$

${\rm{Time }} = \frac{{{\rm{Distance }}}}{{{\rm{Velocity }}}} = \frac{{1000}}{{45 \times \frac{5}{{18}}}} = 80\;sec$

Standard 11

Physics

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