divide 215 by 5 because he stretched 15 minutes so you would subtract 240-25 and that gives you 215 and 215 divided by 5 and that will give you the unit rate which is 43 minutes each day Sal spent jogging. Elena, you would multiply 15 x 5 and that is 75 minutes so you would subtract 300 and 75 which gives you 225. Then you divide 225 by 5 and that equals 45 minutes each day Elena jogged. Hope this helps!