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P and Q need 8 days to complete a work. Q and R need 12 days to complete the same work. But P, Q and R together can finish it in 6 days. How many days will be needed if P and R together do it? | |
A. | 7 [Wrong Answer] |
B. | 8 [Correct Answer] |
C. | 9 [Wrong Answer] |
D. | 10 [Wrong Answer] |