AlgebraHardTwo pipes filling a tank together
Algebra practice question
One pipe can fill a tank in 6 hours, and a second pipe can fill the same tank in 3 hours. How many hours will the two pipes take to fill the tank together?
Answer: 2
In one hour the pipes fill 1/6 + 1/3 = 1/2 of the tank, so together they take 2 hours.
Common wrong answers
- If you answered 9
- 9 adds the two times.
- If you answered 4.5
- 4.5 averages the two times, which is not how rates combine.
- If you answered 1.5
- 1.5 halves the faster pipe's time without reason.
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