Erin is a member of her school's track team. Last week, she ran 8 1/2 laps around the track in 30 minutes. This week, Erin ran for
30 minutes at a constant rate of 2 1/2 minutes per lap. How many more laps did Erin run this week than last week?
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Home » Mathematics » Erin is a member of her school's track team. Last week, she ran 8 1/2 laps around the track in 30 minutes. This week, Erin ran for 30 minutes at a constant rate of 2 1/2 minutes per lap. How many more laps did Erin run this week than last week?