Linear Equations in Two Variables

SAT Math· difficulty 5/5

A plane's airspeed is 400 mph. With a 50-mph tailwind there and 50-mph headwind back, total time for 1750 mi each way:

  • A

    8.508.50 h

  • B

    28000031875\frac{280000}{31875} h

  • C

    8.008.00 h

  • D

    8.898.89 h

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Explanation

1750/450+1750/350=3.8+5=8.88.891750/450 + 1750/350 = 3.\overline{8} + 5 = 8.\overline{8} \approx 8.89.

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