A train covers 90 metres while passing a standing man. What is the length of the train (in metres)?
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A20 m
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B87 m
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C71 m
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D90 m
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E100 m
Answer
Correct Answer: 90 m
Explanation
Introduction / Context:When a train passes a stationary point or a standing man, the distance traversed while completely passing equals the length of the train itself (the man has no effective length to add).
Given Data / Assumptions:
- Distance covered while passing the man = 90 m.
- Man is stationary (length negligible for this context).
Concept / Approach:Distance to pass a point object = train length. Therefore, the measured distance of 90 m equals train length directly.
Step-by-Step Solution:
Train length L = 90 m.Verification / Alternative check:Had it been a platform of length P, we would need L + P; here P = 0, so the observed 90 m is L.
Why Other Options Are Wrong:20, 71, 87, 100 m do not match the given traversal distance for passing a point object.
Common Pitfalls:Confusing post/man cases with platform/bridge cases where extra length is added.
Final Answer:90 m