Two ends of an U-tube manometer which contains mercury, is connected between two pipes (A & B), that carries
of oil of specific gravities 1.05 & 1.4 respectively. The center of the pipe A (left limb) is 12 cm above the pipe B
(right limb). The mercury level difference in the right limb is 2.55 cm and the height of fluid in the right limb is
6.45 cm. Find the pressure difference between these two pipes in Kilo Pascal (kPa).