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

Stan and Hilda can mow the lawn in 40 min if they work together. If Hilda works twice as fast as Stan, how long does it take Stan to mow the lawn alone? Velocity. If a ball is dropped from a height of 256ft. then the formula v(t)=
-32t expresses its velocity in feet per second as a function of time in "t" seconds.
a) Find the v(0), the velocity of the ball at time t=0
b) Find v(4)