A can do a piece of work in 10 days and B in 15 days. How long will they take to finish it working together?
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A and B working together can complete a work in 4 days. If A alone can do the same work in 6 days, then B alone can do the same work in:
12 days
10 days
2 days
24 days
A can do a work in 15 days and B in 20 days. If they work together on it for 4 days, what fraction of the work will be left?