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To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is : | |
A. | 5 min [Correct Answer] |
B. | 10 min [Wrong Answer] |
C. | 15 min [Wrong Answer] |
D. | 20 min [Wrong Answer] |