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Time, Speed & Distance · Question 30 of 71

Question 30

MediumOriginal question

Mohit and Sneha start together from the same point on a 400 m circular track and run in the same direction at 5 m/s and 3 m/s. After how many seconds do they first meet again?

Options for question 30

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Same direction: Mohit gains 5−3=25 - 3 = 2 m every second.

  2. They meet when he has gained one full lap of 400 m.

  3. Time =4002=200= \frac{400}{2} = 200 s.

Worth noting

50 s is the answer if they run in opposite directions, where the relative speed is 5+3=85 + 3 = 8 m/s.

Concept
Circular track: first meeting when the faster gains one full lap
Typical time
60 s
Your time
—
The rule this testsRelative speed
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