Ask some elementary school math questions! !

Question 2: Zhang Ming speed/Li Hua speed = (5/10)/(4/11) = 55/40 =1/8.

Question 3: Assuming that A can type X copies an hour, then B can type (115-x) copies an hour.

The column equation is:115 * 6+(115-x) *12 =1. If it is solved, A will type 1/60 copies every hour.

So it takes 60 hours for A to play alone.

Question 4: You can cut 12 blocks at most.