1 . A water tank can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tankfrom empty state if B is used for half the time , and A B fill it together for the other half?
- A. 30 min
- B. 40 min
- C. 42 min
- D. 57 min
- D. None of these
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