David drove to work at an average (arithmetic mean) speed of 45 miles per hour. After work, David drove home at an average speed of 60 miles per hour. If David spent a total of 2 hours commuting to and from work, how many miles does David drive to work?
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A48
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B$$\frac{256}{5}$$
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C$$\frac{360}{7}$$
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D$$\frac{105}{2}$$
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E$$\frac{160}{3}$$
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正确答案: C