Two athletes simultaneously began to run in a circle from the start. One runs a circle in 3 minutes.

Two athletes simultaneously began to run in a circle from the start. One runs a circle in 3 minutes the second in 4 minutes. How long will it take for both of them to meet at the start?

It is necessary to find out what minutes at the start will coincide for both athletes
The first athlete runs in 3 minutes.
3 + 3 + 3 + 3 = 12 or 3 * 4 = 12 minutes.
Second athlete in 4 minutes.
4 + 4 + 4 = 12 or 4 * 3 = 12 minutes.
Answer: at 12 minutes, both athletes will meet again at the start.