Discussion
A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:
Answer: D
The pole crossing covers the train alone, the platform crossing the train plus 100 m.
\[ L = 15v, \qquad L + 100 = 25v \]
Subtracting:
\[ 100 = 10v \quad\Longrightarrow\quad v = 10 \text{ m/s} \]
\[ L = 15 \times 10 = 150 \text{ m} \]
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