Multiple choice

Two trains, each of length 125 metre, are running in parallel tracks in opposite directions. One train is running at a speed 65 km/hr. and they cross each other in 6 seconds. The speed of the other train is -

  1. 75 km/hr.

  2. 85 km/hr.

  3. 95 km/hr.

  4. 105 km/hr.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total distance to cross = sum of lengths = 125 + 125 = 250 m = 0.25 km. Time = 6 seconds = 6/3600 hours. Relative speed = Distance / Time = 0.25 / (6/3600) = 0.25 × 3600 / 6 = 150 km/hr. Since trains move in opposite directions, relative speed = v1 + v2. So v2 = 150 - 65 = 85 km/hr. Option B is correct.

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