You just need the use the Perimeter formula
Perimeter of a rectangle = 2(width) + 2(length)
Let width be the shorter side = 7 3/8
Perimeter = 32 1/2
You can use fractions or decimals to solve the problem
Perimeter - 2(shorter side)/2 = the longer side
I'll use decimals
32 1/2 = 32.5
7 3/8 = 7.375
Perimeter - 2(shorter side)/2 = the longer side
(32.5 - 2*7.375)/2 = longer side
(32.5 -14.75)/2 = 8.875
8.875 = 8 7/8 is the length of the longer two sides
I hope you find this information useful please send me a message if you have any questions