Linear Equations in Two Variables

SAT Math· difficulty 4/5

A boat travels 24 mi downstream in 2 h and the same distance upstream in 3 h. The current speed is:

  • A

    11 mph

  • B

    22 mph

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  • C

    44 mph

  • D

    33 mph

Explanation

b+c=12b + c = 12, bc=8b - c = 8; subtract: 2c=42c = 4, c=2c = 2.

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