Two taps A and B can fill a tank in 10 hours and 12 hours respectively – McqOptions

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1.	Two taps A and B can fill a tank in 10 hours and 12 hours respectively. If 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 pm.
A.	2
B.	1
C.	3
D.	1.3
Answer» D. 1.3

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