Fruit juice at $293K$ with a density of $1060k\frac{g}{m^3}$ and a viscosity of $2\mathrm{.}15cp$ flows through a glass pipe with a diameter of $70\mathrm{.}5mm$ at a speed of $0\mathrm{.}215k\frac{g}{s}.$

a$)$ Calculate the passage length $(m)?$

b$)$ Calculate the same maximum mass flow rate so that the flow is laminar $(k\frac{g}{s})?$