# Help with related rates problem

## Homework Statement

A 16-ft ladder is sliding down a wall at a rate of 4 ft/sec. Find the velocity of the top of the ladder at t=s if the bottom is 5ft from the wall at t=0.

## Homework Equations

It's a related rates problem.
Not sure how I'm supposed to incorporate t=s into the problem, or if I'm supposed to solve for dx/dt or dy/dt.
Or if I'm even on the right track.

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