Two trains 200 m and 100 m long run on parallel tracks in opposite directions at 72 km/h and 36 km/h. How long do they take to cross each other?
Answer and explanation
Correct answer: D. 10 seconds
- Step 1: Relative speed in opposite directions = 72 + 36 = 108 km/h = 30 m/s.
- Step 2: Time = (200 + 100) / 30 = 10 s.
Answer
10 seconds.
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