Discussion
A train passes a stationary pole in 8 seconds. The train also passes a 200 m long bridge in 28 seconds. What is the length and the speed of the train?
Answer: C
The pole crossing covers only the train:
\[ L = 8v \]
The bridge crossing covers the train plus 200 m:
\[ L + 200 = 28v \quad\Longrightarrow\quad 8v + 200 = 28v \]
\[ 20v = 200 \quad\Longrightarrow\quad v = 10 \text{ m/s} \]
\[ L = 80 \text{ m} \]
Only one option gives a pair consistent with both crossings.
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