Question 619983
1/x + 1/(2x) = 1/4


4/x + 4/(2x) = 1


8/(2x) + 4/(2x) = 1


12/(2x) = 1


12 = 2x


12/2 = x


6 = x


x = 6


2x = 2*6


2x = 12



So 6 hours for the experienced painter and 12 hours for the inexperienced painter.