A runner completes 6 laps around a 400-meter track in 10... | SAT Ratios, rates, proportional relationships, and units Question, Answer Explained

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Math · Problem-Solving and Data AnalysisEasy

A runner completes $6$ laps around a $400$ -meter track in $10$ minutes. What is the runner's average speed, in meters per second?

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Answer: 4

The total distance is $6 \times 400 = 2{,}400$ meters. The total time is $10 \times 60 = 600$ seconds. The average speed is $\frac{2{,}400}{600} = 4$ meters per second.

Dividing $2{,}400$ meters by $10$ gives $240$ , which is the speed in meters per minute, not meters per second.

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