Discussion
How many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 36 kmph?
Answer: C
\[ 1 \text{ kmph} = \frac{5}{18} \text{ m/s} \]
\[ 36 \text{ kmph} = 10 \text{ m/s} \]
\[ t = \frac{100 + 150}{10} = 25 \text{ seconds} \]
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