Problema Solution
If jesse can paint a house in 7 hours and Billy can paint a house in 9 hours. How long will it take them working together?
Answer provided by our tutors
Let x represent the number of hours Jesse and Billy need to paint the house together.
1/x house per hour is the together rate
1/7 house per hour is Jesse's rate
1/9 house per hour is Billy's rate
1/7 + 1/9 = 1/x
........
........
x = 63/16 hr
x = 9.94 hr
x = 3 hr 15*60/16 min
x = 3 hr 56 min 15 s
It will take them approximately 9.94 hr or 3 hr 56 min 15 s working together.