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a math question (help~~~~)

THREE possible actual values of his walking speed:
1. 2.5 x 1-2% = 2.5 x .98 = 2.45m/s
2. 2.5m/s
3. 2.5 x 1+2% = 2.5 x 1.02 = 2.55m/s
FreemanLeung@2008

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