- A9
- B12
- C8
- D10
Step-by-Step Solution
Relative speed = 40 + 32 = 72 km/h = 20 m/s; total length = 200 m, so time = 200/20 = 10 s.
Answer: D) 10
Two trains, 120 m and 80 m long, run in opposite directions at 40 km/h and 32 km/h respectively. How many seconds do they take to completely cross each other?
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