Question
βDβ and βEβ together finish a task in 20 days.
If βDβ is 70% more efficient than βEβ, how many days will βEβ take to complete the task alone?Solution
Let the efficiency of βEβ be 10x units. Efficiency of βDβ = 10x Γ 1.7 = 17x units Total work = 20 Γ (10x + 17x) = 540x units Time taken by βEβ alone = 540x Γ· 10x = 54 days
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