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Ratios, Rates, Proportional Relationships, and Units

SAT Math· difficulty 4/5

A car drives the first half of a 100100-mile trip at 4040 mph and the second half at 6060 mph. What is the average speed for the trip?

  • A

    44 mph

  • B

    52 mph

  • C

    50 mph

  • D

    48 mph

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Explanation

Time =50/40+50/60=1.25+0.833=2.083= 50/40 + 50/60 = 1.25 + 0.833 = 2.083 h. Average =100/2.083≈48= 100/2.083 \approx 48 mph.

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