Problema Solution
Mr. Dodson can paint his house by himself in 4 days. His son needs an additional day to complete the job if he works by himself. If they work together, find how long it takes them to paint the house.
Answer provided by our tutors
The rate of Mr. Dodson is 1/4 house per day.
The rate of Mr. Dodson's son is 1/(4 + 1) = 1/5 house per day.
Let 'x' represent the hours they need to paint the house together.
The together rate is 1/x house per hour.
1/4 + 1/5 = 1/x
........
click here to see the equation solved for x
........
x = 20/9 hr
x = 2 hr (2/9)*60 min
x = 2 hr 13.3 min
It takes them 2 hours and 13.3 minutes to paint the house together.