Discussion
A train is 31m long. It passes a platform which is 175 m long. What is the distance covered by the train in passing the platform?
Answer: A
Passing a platform means the train travels its own length plus the platform's, from the moment its front enters to the moment its rear leaves.
\[ 31 + 175 = 206 \text{ m} \]
No speed or time is needed, so "cannot be determined" is a trap - the distance follows from the two lengths alone.
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