800 meters is very tiring, and the math problem is very difficult.
Basic Law: The ratio of human height to head is about 9: 1, while the ratio of arm length to height is about 1: 1, and the ratio of arm length to height is about 1:3.
In this way, the height of Xiaohong's father is 1.80m. Xiaohong moved a stool with a height of 0.6m. The total height that Xiaohong's father can reach when standing on the stool and raising his hand is: 0.6m+1.80m-1/9+/kloc-0.