Darla drives at a constant speed of 45 miles per hour.
a. If she drives for y miles and it takes her x hours, write the two-variable equation to represent the number of miles Darla can drive in x hours
b. Darla plans to drive to the market 14 miles from her house, then to the post office 3 miles away from the market, and then return home, which is 15 miles from the post office. Assuming she drives at a constant speed the entire time, how long will it take her to get back home after running her errands? Round your answer to the hundredths place
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