(1) As can be seen from the figure, Master Wang walked 5 kilometers in the first ten minutes, took 5 minutes to have breakfast, and then walked the last 5 kilometers in 5 minutes, so the distance from Master Wang's home to the factory is 10 kilometers, and the total time from home to the factory is 20 minutes.

Master Wang takes five minutes to have breakfast.

(3) When leaving home, Master Wang's speed is 5/ 10 = 0.5km/min.

After breakfast, Master Wang's speed is (10-5)/(20-15) =1km/min. Speed up after breakfast, and you will have strength after eating.