A large tanker can be filled by two pipes A and B in 60 minu

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A large tanker 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 tanker from empty state if B is used for half the time and A and B fill it together for the other half?

[DSSSB TGT 2014 (Social Science)]

A 15 min

B 20 min

C 27 min

D 30 min