A company manufactures computers. Function N represents the number of components that a new employee can assemble per day. Function E represents the number of components that an experienced employee can assemble per day. In both functions, t represents the number of hours worked in one day. N(t)=50t over t+4
E(t)=70t over t+3

Which function describes the difference of the number of components assembled per day by the experienced and new employees?