- A11.5
- B25
- C13.5
- D12.5
Step-by-Step Solution
Relative speed = 40 + 32 = 72 km/ m/s. Total distance = 120 + 130 = 250 m. Time = 250 ÷ 20 = 12.5 seconds.
Answer: D) 12.5
Two trains, 120 m and 130 m long, run in opposite directions at 40 km/h and 32 km/h. How long (in seconds) will they take to completely cross each other?
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