1. For a project, Group A will do it alone for 40 days. If Team B works alone for 30 days, Team A and Team B will cooperate for another 20 days.

(1) How many days will it take for Project Team B to complete alone?

A work efficiency = 1/40? Let b's work efficiency be x.

30x+20*( 1/40+x)= 1

50x+ 1/2= 1

x= 1/ 100

1÷ 1/ 100= 100? B It takes 100 days just to do it.

(2) Divide the project into two parts, where it takes X days for Party A to do one part and Y days for Party B to do the other part, where both X and Y are positive integers, X < 15, y < 70, and find xy.

x/40+y/ 100= 1

Because x

62.5 & lty & lt70

Y & lt70? When y=70, x/40+70/ 100 >: 1? x & gt 12

So what? 12 & lt； x & lt 15x= 13？ Or? x= 14

When x= 13 is substituted into x/40+y/ 100= 1? y=？ 67.5 (non-integer rounding)

X= 14，y=65。

So x= 14y=65?

There is water 3 meters deep in the pool. If x meters of water flows out of the drainage pipe every minute, it can be put out in y minutes.

(1) Find the resolution function of x and y and draw the function image? y=3x

(2) When x = 0. 1m, what is the value of time y? X=0. 1？ y=3/0. 1=30