Solution: She walked from home to school in Xiaoya for x minutes.

300+75x+70x= 1 170

300+ 145 x = 1 170

145x=870

x=6

Xiaoya walked from home to school for six minutes.

2.300+6×75

=300+450

=750 meters

Dingding Jr.' s home is 750 meters away from school.

b grade

Aunt Wang's distance+Uncle Li's distance =7.95.

Solution: Let's assume that Uncle Li travels an average of X kilometers per minute by bike.

(30+ 15-0)×0.07+ 15x = 7.95

3. 15+ 15x=7.95

15x=48

x=0.32

The average speed of Uncle Li riding a bike is 0.32 kilometers per minute.

LZ, please, I'm in grade five, too. Since we have been struggling for so long, let's take my answer and say that we have done it here. This is the answer given by our teacher.