A manometer consists of two tubes A and B, with verticalaxes and uniform cross-sectional areas 500 mm2and 800 mm2respectively, connected by a U-tube C of cross-sectional area70 mm2throughout. Tube A contains a liquid of relative density0.8; tube B contains one of relative density 0.9. The surfaceof separation between the two liquids is in the vertical side of Cconnected to tube A. What additional pressure, applied to thetube B, would cause the surface of separation to rise 60 mm inthe tube C?

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