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Linear Equations in One Variable

SAT Math· difficulty 3/5

Pipe A fills a tank in 6 hours and Pipe B in 12 hours. Together they fill the tank at a combined rate. If both run, how many hours to fill?

  • A

    9

  • B

    3

  • C

    6

  • D

    4

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Explanation

Rate: 16+112=312=14\frac{1}{6} + \frac{1}{12} = \frac{3}{12} = \frac{1}{4}. Time = 4 hours.

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