A boat is being pulled toward a dock as shown in the figure to the right. If the rope is being pulled in at the rate of $4$ feet per second, how fast is the distance between the dock and the boat decreasing when it is $3$ feet from the dock?

The distance between the dock and the boat is decreasing by $$ feet per second when the boat is $3$ feet from the dock.

$($Round to the nearest thousandth as needed.$)$