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Homework Statement
A girl enters a ramp with a speed of 30ft/s. The ramp has 4ft in height and 15ft in length. Calculate the speed at which she comes out of the ramp.
Homework Equations

The Attempt at a Solution
I was thinking of just using cosθ=x/z, and just plugging in the values of the derivative (when she enters the ramp) and the value of the length of the ramp and the diagonal distance (finding cosθ with tan^{1}θ; which gives me a final result of 8. However is this solution right? I'm not sure if my procedure is correct (and i don't have the answer to the exercise).