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The length of the bridge which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds is:

200 m
225 m
245 m
250 m
Explanation:
Speed =$ \left(45 \times\dfrac{5}{18} \right) $m/sec=$ \left(\dfrac{25}{2} \right) $m/sec.

Time = 30 sec.

Let the length of bridge be $ x $ metres.

Then,$ \dfrac{130 + x}{30} $=$ \dfrac{25}{2} $

$\Rightarrow$ 2$\left(130 + x\right)$ = 750

$\Rightarrow x $ = 245 m.

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