Question
A, B, C and D are four friends working on a project. The ratio of their efficiencies satisfies C : D = 3 : 4 and A : B = 1 : 2. What is the time taken by D alone to complete the project?
A, B, C and D are four friends working on a project. The ratio of their efficiencies satisfies C : D = 3 : 4 and A : B = 1 : 2. What is the time taken by D alone to complete the project?
I. A and D together can finish the project in 18 days.
II. A, B and C together can complete the project in 15 days.
III. B and D together can complete the project in 15 days.
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