P, Q and R completed a certain project workingtogether. The number of hours for which P worked on the project was2/3rd of that for which Q worked on theproject, which in turn was 2/5th of that for which Rworked on the project. The number of hours for whichRworked is what fraction of the total number of hoursfor which all three worked?(A)2/5(B)3/5(C)7/10(D)1/2
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B
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