Discussion
A train crosses a platform of 150 m in 15 sec, same train crosses another platform of length 250 m in 20 sec. then find the length of the train?
Answer: A
Each crossing covers the train plus that platform.
\[ L + 150 = 15v, \qquad L + 250 = 20v \]
\[ 100 = 5v \quad\Longrightarrow\quad v = 20 \text{ m/s} \]
\[ L = 15 \times 20 - 150 = 150 \text{ m} \]
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