GMAT Problem Solving
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Source: GWD
Level: 3
Three printing presses, R, S, and T, working together at their respective constant rates, can do a certain printing job in 4 hours. S and T, working together at their respective constant rates, can do the same job in 5 hours. How many hours would it take R, working alone at its constant rate, to do the same job?
- A 8
- B 10
- C 12
- D 15
- E 20