(b) A 400mm160mm venturimeter in figure I is provided in a vertical pipeline carrying oil of specific gravity 0.9 . Nlow being upward. The difference in elevation of the throat section and the entrance section of the venturimeter is 400mm. The differential u-tube mercury manometer shows a gauge deflection of 240mm. If the coefficient of discharge is 0.98 and specific gravity of mercury is 13.6. calculate: (i) the discharge of oil. (7) marks) (ii) the pressure difference between the entrance section and the throat section. ( 6 marks)