Jo swims 12 laps in 7 minutes, and we have to find how many minutes it would take to complete 30 laps.
First, we have to figure out how many 12 laps are in 30 laps.
30/12 = 2.5
Since this is a proportion, we have to apply the same 2.5 to 7 minutes.
7 * 2.5 = 17.5 minutes.
It would take Jo 17.5 minutes to complete 30 laps.
Hope this helps!