Multiple choice

Mr. Milkha runs around a track in 30 seconds and I can run around the track in 40 seconds. If we both start at the same time how many seconds will it be until we both cross the starting line together?

  1. 60

  2. 90

  3. 120

  4. 180

  5. 100
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Correct.

Mr Milkha and I will take round trips when at 120 seconds (LCM of the two time periods) from start time he will meet me again at the start line. 

While he is starting his 5th round I will start my 4th.

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