To build a road, team a needs 20 days to build it alone, and team B needs 30 days to build it alone. Now team a and team B work together for several days, and team B has another task, It took 18 days to build the road. How many days did Team B build it

To build a road, team a needs 20 days to build it alone, and team B needs 30 days to build it alone. Now team a and team B work together for several days, and team B has another task, It took 18 days to build the road. How many days did Team B build it

（1-1/20×18）÷（1/20-1/30）
=1/10÷1/60
=6 days

To build a road, it takes 20 days for Party A to build it alone, and 30 days for Party B to build it alone. Now, after several days of joint construction by Party A and Party B, team B transfers out. It took 18 days to build the road. How many days did Team B build it?

(1-120 × 18) / - 130, = (1-910) / - 130, = 110 × 30, = 3 (days). A: Team B repaired it for 3 days