alleryOne inlet pipe fills a tank in 6 hours and another in 12 hours. Both open together fill it in
A9 hours
B5 hours
C4 hours
D3 hours
Answer & Solution
Correct answer: C. 4 hours
Filling rates add to 1/6 + 1/12 = 3/12 = 1/4 of the tank per hour, so 4 hours.
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