1. The degree ratio of a base angle to a vertex angle of an isosceles triangle is 1:4, and its vertex angle is () 2. For a project, it takes 10 days for Party A to do it alone and 15 days for Party B to do it alone. The ratio of working time between Party A and Party B is (), and the ratio of working efficiency is ()

1. The degree ratio of a base angle to a vertex angle of an isosceles triangle is 1:4, and its vertex angle is () 2. For a project, it takes 10 days for Party A to do it alone and 15 days for Party B to do it alone. The ratio of working time between Party A and Party B is (), and the ratio of working efficiency is ()

1: The vertex angle is 180 / (4 + 1 + 1) * 4 = 120
2: The work efficiency ratio is: (1 / 10) / (1 / 15) = 3 / 2
Working time is the inverse ratio of working efficiency, which is 2 / 3