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A tank can be filled by pipe A in 2 hour...

A tank can be filled by pipe A in 2 hours and pipe B in 6 hours. At 10 A.M. pipe A was opened. At what time will the tank be filled if pipe B is opened at 11 A.M.?

A

12:45 hours

B

5:00 p.m.

C

11:45 a.m.

D

11:50 a.m.

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