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let the radius of cylindrical tank =R =30/2=15cm, and height =H=21cm Given- speed of flow= 10m = 1000cm Diameter of base of cylindrical pipe = 5mm Radius =2.5mm = .25cm Now- Area of base ×speed of flow × time = Volume of the cylindrical tank 
.25×.25×1000×t=1/3 ×15×15×21 t = 25.2minute t=25minute 12second.
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