GRE Problem Solving Question 281
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Source: 150math
Three pumps, P, R, and T, working simultaneously at their respective constant rates, can fill a tank in 5 hours. Pumps P and R, working simultaneously at their respective constant rates, can fill the tank in 7 hours. How many hours will it take pump T, working alone at its constant rate, to fill the tank?
- A 1.7
- B 10
- C 15
- D 17.5
- E 30