pipe a sits 1 meter under the river surface its 20cm in diameter and rises vertical 40 meters. pipe a joins pipe b which is also 20cm in diameter. pipe b descends 40 meters downwards. pipe b 1 meter down opens up to 2 meters in diameter and the rest of pipe b is 2 meters in diameter. pipe a is full of water the water weighs 1250kg and is held in position by check valves. at the top of pipe b where pipe b widens to 2 meters diameter is a piston that is 2 meters in diameter. the piston weighs 3000kg considering everything is airtight if the piston is lowered slowly would it be able to draw water up pipe a into pipe b. so if the piston is lowered at a constant rate would the water in pipe a be constantly drawn. the bottom of pipe b is open so there is no pressure under the piston