Need help with these problems and I have to show my work

1. 20 min and 15 sec

2. 4 min and 30 sec

3. y=80x-20

4. the second one

Step-by-step explanation:

1.  in 2 min you have 25 g

in 15 sec you loose 2.5 g

2. in 4 min you have 5 g

in 30 sec you loose 5 g

3. y=45x-10

   y=80x-20

4. it takes 2 min and 15 sec to empty the first one and 3 min to empty the second one.