A differential manometer is connected at the two points A and B of two pipes as shown below. Pipe A contains a liquid of specific gravity of 1.5 while pipe B contains liquid of specific gravity of 0.9. The pressures at A and B are 1 1.8 kgf/cm2 respectively. Find the difference in mercury level (h) in the differential manometer. (1 kgf = 9.81 N; acceleration due to gravity = 9.8 m/s: specific weight of water =9.8 KN/m) Sp. gr.= 1.5 PA kgf /cnf Sp. gr 0.9 3m 2.0 m Pe = 1.8 kgf /cm2 O a. 0.33 m O b. 0.18 m O C. 0.15 m O d. 0.74 m