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Pipe A fills a tank in 8 hours; Pipe B fills it in 12 hours. How long do both pipes take together?
A$10$ hours
B$6$ hours
C$4.8$ hours
D$5$ hours
Answer & Solution
Correct answer: C. $4.8$ hours
Rate of A = 1/8 tank/hour. Rate of B = 1/12 tank/hour. Together = 1/8 + 1/12 = 3/24 + 2/24 = 5/24 per hour. Time = 24/5 = 4.8 hours.
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