Discussion
How long does a train 90 metres long running at the speed of 71 km/hr take to cross a bridge 132 metres in length?
Answer: B
\[ 1 \text{ km/hr} = \frac{5}{18} \text{ m/s} \]
\[ 71 \text{ km/hr} = 71 \times \frac{5}{18} = 19.72 \text{ m/s} \]
\[ t = \frac{90 + 132}{19.72} = \frac{222}{19.72} = 11.26 \text{ seconds} \]
Crossing a bridge covers the train plus the bridge; the train's own 90 m must not be dropped.
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