exam Maths Puzzle Numerical Ability

I am not sure how to set up the equation or how to solve this word problem.

Elena bicycles 5km/h faster then Carlos. In the same time it takes Carlos to bicycle 39km, Elena can bicycle 54km. How fst does each bicyclist travel?

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exam Other Question
Given g(x) = 3x^2 - x + 7, find [g(a + h) - g(a)]/h.

a. 6a + 3h + 1
b. 6a + 3h - 1
c. 6a + 3h + 2
d. 6a + 3h -2
e. none of these FIND ALL RATIONAL ZEROS AND FACTOR f(X).
F(X)=X^3+2X^2-45X-126