There are $60$ minutes in an hour.  It will take $120$ minutes to draw $4$ cartoons.~  $120$ minutes=$2$ hours. 
Peter can draw a cartoon in $30$ minutes. How many hours does it take to paint four cartoons?~(adapted from 2011 Math kangaroo Problems, Level 1-2, Question \#4) 

(1) $$2$$ 
(2) $$3$$ 
(3) $$4$$ 
(4) $$5$$ 
(5) $$6$$ 