Paul drove m miles in h hours; Michelle drove the same distance in 1/2 an hour less. How fast, in miles per hour, did Michelle d

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问题 Paul drove m miles in h hours; Michelle drove the same distance in 1/2 an hour less. How fast, in miles per hour, did Michelle drive?

选项 A、 
B、 
C、 
D、 
E、 

答案E

解析
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