Question

Erin is a member of her school’s track team. Last week, she ran 8½ laps around the track minutes. This week, Erin ran for 30 minutes at a constant rate of 2½ minutes per lap. How many more laps did Erin run this week than last week?

Answer 1

Erin ran 3.5 more laps this week than she did last week.

Step-by-step explanation:

We can calculate the number of laps Erin ran this week by dividing the total time she ran by the time per lap. This week, Erin ran for 30 minutes at a constant rate of 2½ minutes per lap:

30 minutes ÷ 2.5 minutes/lap = 12 laps

Last week Erin ran 8½ laps. To find out how many more laps she ran this week than last week, we subtract last week's laps from this week's laps:

12 laps - 8.5 laps = 3.5 laps

So, Erin ran 3.5 more laps this week than last week.