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