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[" and "B" together can do a piece of wo...

[" and "B" together can do a piece of work in "10" days,but "A" alone can do it in "15" days.How many days "],[" ould "B" alone take to do the same work? "],[" wo men can do a niece of work in "6" hours and "4" hours respectively.After the first has worked for "2]

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