Multiple choice

A train 100 metres long moving at a speed of 50 km/h crosses a train 120 metres long coming from opposite direction in 6 seconds. The speed of the second train is

  1. $132 km/h$
  2. $82 km/h$
  3. $60 km/h$
  4. $50 km/h$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed = (100 + 120) / 6 = 220 / 6 = 110/3 m/s. Convert to km/h: (110/3) * (18/5) = 132 km/h. Since they move in opposite directions, relative speed = v1 + v2. 132 = 50 + v2, so v2 = 82 km/h.

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