Question

Use the Chain Rule to find the rates of change of two or more variables with respect to time, giving us expressions such as dy/dt, dx/dt ,dV/dt, dr/dt
A 13 ft ladder is leaning against a wall. Suppose that the base of the ladder slides away from the wall at the constant rate of 3ft/sec. How fast is the top of the ladder sliding down the wall when the base of the ladder is 5 ft from the wall?