Two pipes of diameters d1 and d2 converge to form a pipe of diameter 2d. If the liquid flows with a velocity of v1 and v2 in the two pipes, what will be the flow velocity in the third pipe?

• A. v1 + v2
• B. v1 + v2/2
• C. v1 + v2/4
• D. 2(v1 + v2)