Her swimming rate can either be written as 1.6 laps per (one) minute or as 0.625 minutes per lap = 37.5 seconds per (one) lap. In terms of number of laps per minute, the answer is 20 laps 12.5 minutes = 1.6 laps per minute.
In terms of the number of minutes per lap, the answer is 12.5 minutes 20 laps = 5 8 = 0.625 minutes per lap. This is the same as 0.625 min lap ⋅ 60 sec min = 37.5 sec lap
The faster she goes, the more laps she can do in a minute and the fewer minutes (or seconds) it takes her to do one lap.
