Fighting the wind

A boat is trying to sail against the wind like in the picture. The wind blows from the North with ${v}_\text{wind}=10\text{ ms}^{-1}$ . The keel direction makes the angle $\alpha ={{30}^{\circ }}$ with the West-East line. Between the sail and the keel direction is the angle $\beta={{30}^{\circ }}$ . What is the speed of the boat relative to the water in $\text{m/s}$ ?

Assume there is no friction or drag.