Multiple choice

Two trains of length 100 m and 200 m are moving with speed 30 m/s and 20 m/s respectively.How much time it will take to cross each other when they are going in same direction?

  1. 20 sec

  2. 21 sec

  3. 18 sec

  4. 30 sec

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When trains move in the same direction, their relative speed is the difference of their individual speeds: 30 - 20 = 10 m/s. The total distance to cover is the sum of their lengths: 100 + 200 = 300 m. Time = Distance/Relative Speed = 300/10 = 30 seconds.

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