Patrick, by himself, can paint four rooms in 10 hours. if he hires april to , they can do the same hob together in 6 hours. if he lets april work alone, how long will it take her to paint four rooms?

 15 hours

Step-by-step explanation:

Given : Patrick, by himself, can paint four rooms in 10 hours.

i..e Time taken by Patrick to paint the 4 walls =  10 hours.

Since rate of work =

We consider the entire job as 1.

Then, the rate of work done by Patrick =

If he hires April to help, they can do the same hob together in 6 hours.

i.e.  the rate of work done by Patrick and April together =

Then, the rate of work done by April = rate of work done by Patrick and April together - rate of work done by Patrick

Hence,it will take 15 hours April to paint four rooms .

ok then what happened.