For a Kaplan (axial flow) turbine, the outlet blade velocity diagram at a section is shown in the figure.

The diameter at this section is $3\:m$.The hub and tip diameters of the blade are $2\:m$ and $4\:m$, respectively. The water volume flow rate is $100\:m^{3}/s$. The rotational speed of the turbine is $300\:rpm$. The blade outlet angle $\beta$ is ________ degrees (round off to one decimal place).

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