Linear Equations in Two Variables

SAT Math· difficulty 5/5

A swimmer goes 500 m at 1.25 m/s and walks back at 2.5 m/s. Total time:

  • A

    600600 s

    check_circle
  • B

    700700 s

  • C

    500500 s

  • D

    400400 s

Explanation

500/1.25+500/2.5=400+200=600500/1.25 + 500/2.5 = 400 + 200 = 600 s.

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