- A30 s
- B18 s
- C12 s
- D15 s
Step-by-Step Solution
A standing train acts like a platform: distance = m at 10 m/s → 30 s.
Answer: A) 30 s
A 180 m train moving at 36 km/h passes a 120 m train that is standing still on the next track. How long does it take?
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