The efficiencies of A, B and C are in the ratio of 5 : 3 : 2. Working together, they can complete a task in 21 hours. In how many hours will B alone complete 40% of that task?
Total 1 hour work = 2d + 5d + 3d = 10d
Work completed in 21 hours
=> total Work = 21 $$\times$$ 10d = 210d
40% part of work = (40/100) $$\times$$ 210d = 84d
B's 1 hour work = 3dÂ
B can complete 40% part of that work in = 84d $$\div$$3d = 28
So , the answer would be option b)28.
Create a FREE account and get:
Quick, easy and effective revision
