Discussion
A train 100 m long crosses a platform 125 m long in 15 sec; find the speed of the train?
Answer: C
Crossing the platform covers the train plus the platform.
\[ v = \frac{100 + 125}{15} = 15 \text{ m/s} \]
\[ 15 \times \frac{18}{5} = 54 \text{ kmph} \]
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