Team a and team b will repair a section of the road. If Team A and Team B cooperate, it will be completed in 12 days. If a project team does it alone, it takes twice as long for team B to complete the project alone as it takes for team A to complete the project alone.

1. How many days will it take for Party A and Party B to complete this project alone?

1/ 12* 1/3= 1/36

1/ 12*2/3= 1/ 18

It takes 18.36 days for Party A and Party B to complete this project independently.

2 If Party A needs daily engineering expenses in 650 yuan and Party B needs daily engineering expenses in 400 yuan, which scheme should be chosen for construction from the perspective of saving money?

18 * 650 =11700 yuan.

36*400= 14400 yuan

Choose one11less than 700 yuan 14400 yuan.