Question 775419
Painter can paint a kitchen in 15 hours
His apprentice can paint the same kitchen in 30 hours.
Painter's rate = 1/15 job/hr
Apprentice's rate = 1/30 job/hr
Together rate 1/x job/hr
1/15 + 1/30 = 1/x
Common Denominator = 30x
2x + x = 30
3x = 30
x = 10
They could paint the kitchen in 10 hrs together.
Hope this helps.
;-)