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Key Concept: When two objects move in opposite directions, their relative speed = sum of their speeds.

Step 1: Convert Units
Train speed: 48 km/h = 48 × 1000 ÷ 3600 = 40/3 m/s
Man's speed: 100 m/min = 100 ÷ 60 = 5/3 m/s

Step 2: Find Relative Speed
Since they're moving toward each other (opposite directions):
Relative speed = 40/3 + 5/3 = 45/3 = 15 m/s

Step 3: Calculate Time
For the train to "completely pass" the man, it must cover its entire length (120 meters) relative to the man.
Time = Distance ÷ Speed = 120 ÷ 15 = 8 seconds

Answer: D
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