That is, the cooperation days between Party A and Party B (1-110) ÷ (1/8+1/0) = 4 days+working days of Party B alone+1.
Where 1/8 is the daily workload of nailing, and110 refers to the daily workload of Party B;
And1-110 refers to the workload completed by both parties, that is, except for the part where Party B works one day, so it is1-10.