SOLUTION: it takes two sisters to shovel their driveway together and it takes them 30 min. one day one of the sisters had to shovel by herself. it took her 40 min. how long will it take the

Question 265613: it takes two sisters to shovel their driveway together and it takes them 30 min. one day one of the sisters had to shovel by herself. it took her 40 min. how long will it take the other sister to shovel the driveway by herself
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

If A can do a job in x time periods, then A can do

of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do

of the job in 1 time period.

So, working together, they can do

of the job in 1 time period.

Therefore, they can do the whole job in:

time periods.

In your situation, you have:

Just solve for

John