- A10
- B12
- C8
- D40
Step-by-Step Solution
Relative speed = 54 + 90 = 144 km/h = 40 m/s. Distance = 150 + 250 = 400 m, so time = 400 ÷ 40 = 10 s.
Answer: A) 10
On parallel tracks, a 150 m train at 54 km/h and a 250 m train at 90 km/h approach each other. How many seconds pass from the moment they meet until they are completely clear of each other?
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