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A Driver Calculates That If She Decreases Her Average Speed 15mi./h15 \mathrm{mi} . / \mathrm{h}

Question 130

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A driver calculates that if she decreases her average speed by 15mi./h15 \mathrm{mi} . / \mathrm{h} , she would travel her 650 -mile trip in 3.0hr3.0 \mathrm{hr} more time than at her usual speed. What is her usual speed?

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