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GRE数学真题
Noelle walks from point A to point B at an average speed of 5 kilometers per hou...
Question 19
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Noelle walks from point A to point B at an average speed of 5 kilometers per hour. At what speed, in kilometers per hour, must Noelle walk from point B to point A so that her average speed for the entire trip is 6 kilometers per hour?
A.6.75
B.7
C.7.25
D.7.5
E.7.75
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