Correct Answer: 30
Explanation:
Step 1: Understand what's given
Step 2: Use relative speed
When two objects move in the same direction, we subtract their speeds:
Relative speed = 63 - 3 = 60 km/h Convert to m/s: 60 × (1000 / 3600) = 60 × 5/18 = 16.67 m/s
Step 3: Calculate time to cross
Time = Distance / Speed
Time = 500 / 16.67 ≈ 30 seconds
Answer: The train will take approximately 30 seconds to cross the man.
This problem is a classic example of relative motion, where:
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