How do I set up these problems and solve them? What are they really asking and what do they mean?

Please note that this is the only information I was given. There is no missing data. This is not an incomplete question.

Assume that x and y are both differentiable functions of t and find the required values of dy/dt and dx/dt. y = Vx (a) Find dy/dt, given x = 1 and dx/dt = 5. dy/dt = (b) Find dx/dt, given x = 81 and dy/dt = 7. dx/dt =