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A cistern has two taps which fill it in 12 min. and 15 min.respectively There is one outlet pipe in the cistern. When all the taps & pipe are opened, the empty cistern is full in 20 min. How long will the waste pipe (outlet) take to empty the full cistern ? | |
A. | 10 min [Correct Answer] |
B. | 20 min [Wrong Answer] |
C. | 30 min [Wrong Answer] |
D. | 40 min [Wrong Answer] |