A sailor in a boat, which is going due east with a speed of \(8 m/s\), observes that a submarine is heading towards north at a speed of \(12 m/s\) and sinking at a rate of \(2 m/s\). The commander of the submarine observes a helicopter ascending at a rate of \(5 m/s\) and heading towards west at \(4 m/s\). Find the speed of the helicopter with respect to the boat in \( m/s\).

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