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A large tanker can he filled by two pipe...

A large tanker can he filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half? `15\ m in` b. `20 m in` c. `30\ m in` d. `27. 5\ m in`

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