Tony and Debra walk around a track. Tony walks each lap in
minutes. Debra walks each lap in
minutes. The two of them begin at the starting line at the same time. They walk until they meet again at the starting line.
The least common multiply of 10 and 6 is 30.
So, in 30 minutes, they will meet at the starting point.
Tony will have walked 3 laps and Debra will have walked 5 laps.