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Driving from the city to visit a friend in the country, suppose
a person drives at an average speed of 15 miles per hour on
city streets and 40 miles per hour on the highway. Suppose the
person spends C hours on city streets and H hours driving on
the highway, and the friend lives 60 miles away.
a. Write an equation relating C, H, and the total distance.
b. If the person spent 2 hours driving on city streets, how many
minutes did the person spend on the highway?