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Time & Work
Time, Distance and Speed

A and B can complete a work in 20 days. If A works alone for 5 days and then B joins him, how many more days will they take to finish the work?

Answer: A. 10 days
A completes 1/20 of the work in 5 days. The remaining work is 19/20, which A and B can complete together in 10 days.
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