Question

please solve it fast ​

Answer 1

Answer:

20

Step-by-step explanation:

the work done in one minute by pipe A = 1/36

the work done in one minute by pipe B =1/45

so work done in one minute by both = 1/36+1/45

= (5+4)/180= 9/180= 1/20

that means if those two works then they can fill in 20 min