A sailor went to sea, sea, sea to see what he could see, see, see

A sailor in a boat, which is going due east with a speed of 8m/s8 m/s, observes that a submarine is heading towards north at a speed of 12m/s12 m/s and sinking at a rate of 2m/s2 m/s. The commander of the submarine observes a helicopter ascending at a rate of 5m/s5 m/s and heading towards west at 4m/s4 m/s. Find the speed of the helicopter with respect to the boat in m/s m/s.

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