Laminar flow in a horizontal pipe of diameter D gives a flowrate of Q if the pressure gr...

Laminar flow in a horizontal pipe of diameter D gives a flowrate of Q if the pressure gradient is . The fluid is cooled so that the density increases by a factor of 1.04 and the viscosity increases by a factor of 3.8. Determine the new pressure gradient required (in terms of K) if the flowrate remains the same.