Sludge from crude oil processing plant is channeled to a waste tank via a 100 mm pipeline. The sludge has a viscosity of 0.9 Ns/m and specific gravity 1.5. Due to its dense nature, it only flows within a laminar region. If the shear stress at the pipe wall is 150 N/m2, determine the pressure gradient, the average velocity, and the Reynolds number of the flow. (8 marks)