The relationship between time and the distance remaining on a 3-mile walk for someone walking at a steady rate of 2 miles per hour

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Puzzling

Let d be the remaining distance.  

Let t be the remaining time.  

The standard distance equation is:  

d = rt  

We are given the rate as 2, so:  

d = 2t  

At the start of the walk, the remaining distance is 3 miles.  

The remaining time is 1.5 hours.  

At the end of the walk, the remaining distance is 0 miles.  

The remaining time is 0 hours.  

A graph of the distance and time would be a continuous, solid line. That's because the walker will be at every distance between 3 and 0 and every time between 1.5 and 0.

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the correct answer is $7.38

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