A hiker wanted to hike to a lake 26 km from the end of the road. She started at 6 a. m. and walked steadily until 9:00 a. m. She stopped for a 1-hour rest and then continued until she stopped for 1.5 h to have lunch. She took only one 0.5 h rest in the afternoon and arrived at the lake at 7:00 p. m. a. What was the hiker’s average speed from the end of the road to the lake?

b. What was the hiker’s average speed during the time she was actually hiking?