Problem-Solving and Data AnalysisVery hardTwo taps filling a tank together
Problem-Solving and Data Analysis practice question
One tap can fill a tank in 6 hours and a second tap can fill the same tank in 3 hours. If both taps run together, how many hours does it take to fill the tank?
Answer: 2
Together they fill 1/6 + 1/3 = 1/2 of the tank per hour, so 2 hours.
Common wrong answers
- If you answered 3
- 3 uses only the faster tap.
- If you answered 9
- 9 adds the times.
- If you answered 4.5
- 4.5 averages the two times.
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