The average rate of the first part of Yi’s walk on a park loop was 4 miles per hour. She then met up with a friend and the two walked the rest of the way at an average rate of 5 miles per hour. The entire 3-mile walk took Yi 42 minutes (0.7 hour). Which equation can be used to solve for x, the time in hours that Yi spent walking before meeting her friend? Rate (mi/h) Time (h) Distance (miles) Part 1 4 x 4 x Part 2 5 0 point 7 minus x 5 times open paren 0 point 7 minus x close paren