Fluid Mechanics
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

Q = Q₁ + Q₂ + Q₃
Q₁ = Q₂ = Q₃
F = f₁ + f₂ + f₃
V₁ = V₂ = V₃

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Fluid Mechanics
A stream line is

A line connecting the mid points of flow cross-section
Drawn normal to the velocity vector at every point
Always the path of particle
Fixed in space in steady flow

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