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It will take john 4 days to string a certain fence. If Mary could string the same fence in 3 days, how long will it take them if they work together?

A. 3 1/2 days
B. 3 days
C. 2 1/2 days
D. 1 5/7 days
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সঠিক উত্তরঃ D. 1 5/7 days
Explanation: