Question 929870
The painter can do 1/12 of the job per hour.
The apprentice can do 1/24 of the job pet hour.
Together, they would do1/12+1/24=3/24 of the job each hour, 
so, to do the whole job together, it will take them
{{{1/(("3 /24"))}}}={{{24/3}}}{{{hours=8hours}}}