The efficiencies of A, B and C are in the ratio of 5 : 3 : 2. Working – McqOptions

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1.	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?
A.	24
B.	28
C.	35
D.	21
Answer» C. 35

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