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.?

• ক 12 A.M.
• খ 11.45 A.M. ✅ সঠিক উত্তর
• গ 12.35 A.M.
• ঘ 11 A.M.