Discussion
How long does a train 110 m long running at the speed of 72 km/hr takes to cross a bridge 132 m length?
Answer: B
\[ 1 \text{ km/hr} = \frac{5}{18} \text{ m/s} \]
\[ 72 \text{ km/hr} = 20 \text{ m/s} \]
\[ t = \frac{110 + 132}{20} = \frac{242}{20} = 12.1 \text{ seconds} \]
Both the train and the bridge must be cleared, so their lengths add.
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