At LNG refinery site as part of a lubricating system for heavy machinery, oil of density 850kg/m^3 is pumped through a cylindrical pipe of diameter 7.0cm at a rate of 10.5 litres per second. What is; (Given: 1000 litres = 1m^3)

a) the spread of the oil?
(Use this formula: flow rate/ cross-section area = velocity)

b) the mass flow rate?
(Use this formula: mass flow rate= density x cross-sectional area x velocity)