A tank can be filled by pipe A in 4 hours and pipe B in 6 hours. At 8:00 a.m., pipe A was opened. At what time will the tank be filled if pipe B is opened at 9:00 a.m.?
A
10:16 a.m.
B
10:22 a.m.
C
10:48 a.m.
D
10:18 a.m.
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Question: A tank can be filled by pipe A in 4 hours and pipe... - PrepLeague