It takes april 7 1/3 hours to drive to her grandparents’ house. so far she has driven 3 5/6 hours. how many more hours does april need to drive?

First you have to take the mixed numbers and turn them into common fractions
22/3 and 23/6 
then you take the 22/3 and multiply it by 2 so that the two fractions have the same denominator
44/6 then you have to subtract 23/6 from 44/6 and turn it back into a mixed number
44/6-23/6= 21/6---> 3 3/6 ---> 3 1/2
April has to drive for 3 1/2 more hours to get to her parent's house

Could you explain what your problem is? I am confused. with all due respect  :^)