Problema Solution
karl can clean his room in 3 hours. His brother can do the same job in 4 hours. How long will it take the to finish the job if they work together?
Answer provided by our tutors
Time needed working together: x
So the equation is
1/3 + 1/4 = 1/x
So
x = 12/7
So Time needed working together is 12/7 hours