3. What water pressure should be maintained by the pumping station of the building located in the basement of the main building so that the water pressure in the pipes at the top floor is not less than 1-5 kg-wt/cm2. The height of the top floor is 200 m above the pumping station.
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6@#-"5"+stetjskgjgsngsfjkgkgtjtjktktktly
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