What is the growth rate of the function f(x)=1.35x?

I’m stuck on this equation, anyone got the answer?

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?