Exit Velocity of the Fluid?

The question

In the picture, the pressure tank has lets water at a pressure of 7.5 megapascals. Now we know all the way down stream there is a pressure of 4 megapascals, so fluid will flow from the pressure tank downstream. What is the velocity of the fluid in the pipe just after the pressure tank if it has a diamater of 0.5in, and the pressure tank has a radius of 5in.

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