Lesson eLearning

Two trains start at the same time from stations A and B that are 420 km apart and travel towards each other. Train X moves at 75 km/h and Train Y at 65 km/h. After how many hours will they meet?

hard MCQ 3 marks Class 7 · Science · Motion and Time
  1. 2 hours
  2. 2.5 hours
  3. 3 hours
  4. 3.5 hours
Answer
3 hours

The correct answer is 3 hours — Time to meet = distance ÷ relative speed = 420 ÷ 140 = 3 hours.

Step-by-step solution

  1. Relative speed = speed of X + speed of Y = 75 + 65 = 140 km/h.
  2. Time to meet = distance ÷ relative speed = 420 ÷ 140 = 3 hours.
Common mistake: Adding speeds incorrectly or using wrong distance

Concept tested: Relative speed of two moving bodies

Published · How this solution was prepared and checked

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