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Fluid flows with velocity 2

Should I do the dot product of the position vector P=[1,2,4] and b vector, then multiply this by unit vector that is in the direction of the b vector, and then dot the result with the velocity vector?

**i**- 3**j**m/s at point P having coordinates (1,2,4). Consider a plane through P which is normal to the vector b=-**i**+2**k**. What is the speed at which the fluid passes through the plane?Should I do the dot product of the position vector P=[1,2,4] and b vector, then multiply this by unit vector that is in the direction of the b vector, and then dot the result with the velocity vector?

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