Please help! Struggling a little

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

Sum is 17 and their difference is 3