Ratios, Rates, Proportional Relationships, and Units

SAT Math· difficulty 4/5

A car drives 6060 miles at 3030 mph, then 6060 miles at 6060 mph. What is the average speed for the entire trip?

  • A

    48 mph

  • B

    50 mph

  • C

    40 mph

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  • D

    45 mph

Explanation

Time =2+1=3= 2 + 1 = 3 h. Distance =120= 120. Average =120/3=40= 120/3 = 40 mph.

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