Everyone's favorite professor at the local university has just discovered a second universe he has called Wackyland.
To everyone's surprise, the elementary charge in Wackyland differs from the elementary charge ($e$) in our Universe.
In Wackyland, protons have a charge of $+5/2 e$ and neutrons still have a charge of $0 e$. It is determined that protons in Wackyland consist of 3 up quarks and 2 down quarks. Neutrons consist of 1 up quark and 4 down quarks.
In terms of $e$, what is the charge of an up quark and a down quark?