2. Jack ran 5 miles in 42.5 minutes. Jill ran 3 miles in 23.25 minutes. Who ran faster? How do you know?
2 answers:
Jill ran faster. I know because I compared both of their unit rates.
Jack's unit rate is 5/42.5 = 0.118 mile per minute (rounded)
Jill's unit rate is 3/23.25 = 0.129 mile per minute (rounded)
Jill runs a greater part of a mile per minute than Jack does.
She is faster. There's no getting around it.
Jack: 42.5 ÷ 5 = 8.5
Which means Jack runs 1 mile in 8.5 minutes
jill: 23.25 ÷ 3 = 7.75
Which means Jill runs 1 mile in 7.75 minutes
Jill is faster
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