2.43 In Fig. P2.43 pipe A contains gasoline (SG = 0.7), pipe B contains oil (SG= 0.9), and the manometer fluid is mercury. Determine the new differential reading if the pressure in pipe A is decreased 25 kPa, and the pressure in pipe B remains constant. The initial differential reading is 0.30 m as shown. 0.4 m Oil +3 + 0.3 m -Mercury Gasoline FIGURE P2.43