Question 568307
    a painter can finish painting a house in 8 hours. Her assistant takes 10 hours to finish the same job. how long would it take for them to complete the job if they were working together?
Let x = time (hours) it takes working together
then
x(1/8 + 1/10) = 1
multiplying both sides by 80:
x(10 + 8) = 80
x(18) = 80
x = 80/18
x = 4.44 hours
or
x = 4 hours and 27 minutes