Linear Equations in Two Variables

SAT Math· difficulty 3/5

Two cars start 300 miles apart and drive toward each other. One at 50 mph, other at 70 mph. They meet in:

  • A

    2.52.5 h

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  • B

    55 h

  • C

    33 h

  • D

    22 h

Explanation

Combined speed 120120 mph; time =300/120=2.5= 300/120 = 2.5 h.

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