Multiple choice general knowledge math & puzzles

2 trains coming from opposite direction are 55 km apart and they will collide after 15 mins.the speed of 1 train is 120 kmph what is the speed of other?

  1. 90kmph

  2. 100kmph

  3. 110kmph

  4. 80kmph
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When two trains approach each other, their relative speed equals the sum of individual speeds. Distance = 55 km, time = 15 min = 0.25 hours. Relative speed = 55/0.25 = 220 kmph. If one train moves at 120 kmph, the other must be 220 - 120 = 100 kmph for them to meet in 15 minutes.

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