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Linear Equations in One Variable

SAT Math· difficulty 4/5

Pump A fills a tank in 44 hours, pump B in 66 hours. Working together, how long do they take to fill it?

  • A

    5.0 hours

  • B

    2.5 hours

  • C

    2.4 hours

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  • D

    2.0 hours

Explanation

14+16=512\frac{1}{4} + \frac{1}{6} = \frac{5}{12}. So t=125=2.4t = \frac{12}{5} = 2.4 hours.

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