A completes a lap in 4 minutes and B in 6 minutes. They start together from the same point and run in opposite directions. After how many minutes do they first meet?

2 minutesCorrect answerYour answer2.4 minutesCorrect answerYour answer5 minutesCorrect answerYour answer12 minutesCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer B

Correct answer: B

Together they cover $\frac{1}{4} + \frac{1}{6} = \frac{5}{12}$ of a lap a minute.
One lap between them takes $\frac{12}{5} = 2.4$ minutes.

Worth noting

12 minutes is when both are next at the start, LCM(4, 6), not their first meeting.

Ten questions from Races & Games, at your own pace.

Explanation