Discussion
How long does a train 165 meters long running at the rate of 54 kmph take to cross a bridge 660 meters in length?
Answer: C
\[ 1 \text{ kmph} = \frac{5}{18} \text{ m/s} \]
\[ 54 \text{ kmph} = 15 \text{ m/s} \]
\[ t = \frac{165 + 660}{15} = \frac{825}{15} = 55 \text{ sec} \]
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