Linear Equations in Two Variables

SAT Math· difficulty 4/5

A plane has groundspeed 500 mph with no wind. With a 50-mph headwind, time to travel 1800 mi:

  • A

    3.83.8 h

  • B

    3.63.6 h

  • C

    4.04.0 h

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  • D

    4.54.5 h

Explanation

Effective speed 450450 mph; 1800/450=41800/450 = 4 h.

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