Answer :

Given,


A and B can polish a building in = 10 days


A alone can do of it in 12 days


(A+B)’s 1 day work =


A’s I day work =


B’s 1 day work = (A+B)’s 1 day work – A’s 1 day work =


Thus B can finish the work in = days.


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RS Aggarwal - Mathematics