One student can paint a wall in 20 minutes. Another student can paint the same wall in 30 minutes. Working together, how long wi

Question

3 years ago

14

ll it take for them to paint the wall?
10 minutes

12 minutes

15 minutes

25 minutes

1 answer:

Katarina [22] · Answer 1 · 2022-01-20T15:58:06+03:00

5 0

1) in one minute for first wiil be 1/20

the other 1/30, it means that A paint in one minute 1/20 and B 1/30 then A+B in one minute 1/20 + 1/30 = 3+2/60 = 5 / 60, 5/60 = 1/12

if in one min they make 1/12 then in 12 min they paint all the wall