A pilot satic is used to measure the velocity of water using a differential gauge which contains a manometric fluid of relative density 1.4. The deflection of the gauge fluid when water flows at a velocity 1.2 m/s will be (the coefficient of the tube may be assumed be.1)
(a) 183.5 mm (b) 52.4mm
(c) 5.24 mm (d) 73.4 mm