Two trains, 150 m and 210 m long, run on parallel tracks in opposite directions at 45 km/h and 63 km/h. How many seconds do they take to cross each other completely?
A. 12
B. 10
C. 15
D. 24
1 answer
Best answer
Answer: A. 12
Answer: (A) 12
Relative speed = 108 km/h = 30 m/s. Distance = 150 + 210 = 360 m. Time = 360 ÷ 30 = 12 s.
Doubtly AI
· 27 Oct 2026
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