On Sunday, he went to the Children's Palace from home to learn poetry and calligraphy, and then went home. The distance and time relationship between him and his family.

(1) According to the functional diagram, Xiaogang's distance from home to Shenzhen Book City is 4000m.

(2)30-20= 10 (minutes).

So Xiaogang stayed in the book city for 10 minutes;

(3) Xiaogang's journey from Book City to Children's Palace is 6250-4000=2250 meters, and it takes 35-30=5 minutes.

The riding speed of Xiaogang from Book City to Children's Palace is 2250 ÷ 5 = 450 (m/min);

(4) 6000++= 6000+2000+2250 =10250 (m).

A: From home to the Children's Palace, Xiaogang rides a bike 10250 meters.