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M: +1.00/-0.25

Two taps A and B can fill a tank in 10 hours and 12 hours respectively. If the two taps are opened at 10 a.m., then at what time (in p.m.) should the tap A be closed to completely fill the tank at exactly 4 p.m.?

[SSC CPO 2 July 2017 Morning Shift With Answers]
A
B
C
D
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