A $100\, m$ long train is moving with a uniform velocity of $45\, km/hr$. The time taken by the train to cross a bridge of length $1 \,km$ is.........$s$
A $100\, m$ long train is moving with a uniform velocity of $45\, km/hr$. The time taken by the train to cross a bridge of length $1 \,km$ is.........$s$
$58$
$68$
$78$
$88 $
A $100\, m$ long train is moving with a uniform velocity of $45\, km/hr$. The time taken by the train to cross a bridge of length $1 \,km$ is.........$s$
Length of train $= 100\,m$
Velocity of train$ = 45\;km/hr = 45 \times \frac{5}{{18}} = 12.5\;m/s$
Length of bridge $= 1 \,km = 1000\, m$
Total length covered by train $= 1100 \,m$
Time taken by train to cross the bridge $ = \frac{{1100}}{{12.5}}= 88 \,sec$
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