4 laps /7 1/2 min ( the fraction of four laps and 7 minutes and 30 seconds)
1 lap /1.875 min (divided both numbers by 4 to find how long it took her to run one lap)
1.875 min x 60= 112.5 ( you want to multiply by 60 to find the seconds)
1 lap/ 112.5 seconds
