[" Working individually,"A" and "B" can ...

[" Working individually,"A" and "B" can complete a "],[" piece of work in "30" days and "45" days,respectively "],[" If "B" joins "A" after some days and the whole work "],[" is completed in "20" days from the beginning,after "],[" how many days does "B" join "A" ? "]

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[" Working individually,"A" and "B" can complete a "],[" piece of work in "30" days and "45" days,respectively "],[" If "B" joins "A" after some days and the whole work "],[" is completed in "20" days from the beginning,after "],[" how many days does "B" join "A" ? "]

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