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Easy: Compare speeds
To compare two rates, change each one to a unit rate: miles per hour, or dollars per pound. Then compare the unit rates. The greater speed is faster; the lower unit price is the better buy.
Find each unit rate, then answer the question.
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Find each unit price: $4.50 ÷ 3 = $1.50 per pound and $7 ÷ 5 = $1.40 per pound. The 5-pound bag costs less per pound, so it is the better buy.
Unit rates put both options on the same footing: how much for exactly one hour or one pound. Then a single comparison of two numbers answers the question.
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