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Mercury is poured into a U-tube in which the cross-sectional area of the left-hand limb is
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Mercury is poured into a U-tube in which the cross-sectional area of the left-hand limb is three times smaller than that of the right one. The level of the mercury in the narrow limb is a distandce `l=30 cm` from the upper end of the tube. How much will the mercury level rise in the right-hand limb if the left one is filled to the top with water?