just need problem 3! thanks

(l Study the given figure and observe the dimensions and the Hg manometer reading. If the flow of gasoline ( s=0.82)Q=8.03cfs, find the pressure at the lower pressure gauge in psi \& find the manometer reading hm in inches. 3-86. What is the discharge in the pipe line if oil (sp. gr. =0.8 ) is flowing as shown? Cavitation Water at a temperature of 80F flows through the horizontal constriction of Fig. S5.8 at a rate of 65cfs when the atmospheric pressure is 27.9 in Hg. Find the largest throat constriction diameter D2 which will cause cavitation. (l Study the given figure and observe the dimensions and the Hg manometer reading. If the flow of gasoline ( s=0.82)Q=8.03cfs, find the pressure at the lower pressure gauge in psi \& find the manometer reading hm in inches. 3-86. What is the discharge in the pipe line if oil (sp. gr. =0.8 ) is flowing as shown? Cavitation Water at a temperature of 80F flows through the horizontal constriction of Fig. S5.8 at a rate of 65cfs when the atmospheric pressure is 27.9 in Hg. Find the largest throat constriction diameter D2 which will cause cavitation