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求助一道JJ
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102 PS. Linda walked at a constant speed of r, and passed one point of the city board at 12:00 at noon. Sue also walked at a constant speed and passed the same point at 1:00 that afternoon. How far Linda walked away from that point when she was compassed by Sue?
A. r B. 2/3 r C 3/2 r D 2r E: 3r |
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