Question
The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
Answer: Option C
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Speed =\(\left(45\times\frac{5}{18}\right)m/sec= \left(\frac{25}{2}\right)m/sec.\)
Time = 30 sec.
Let the length of bridge be x metres.
Then,\(\frac{130+x}{30}=\frac{25}{2}\)\(\Rightarrow2\left(130+x\right)= 750\)
\(\Rightarrow x =245m.\)
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