Flow Arithmetic: Volume, Time and Mean Velocity

Flow Arithmetic: Volume, Time and Mean Velocity

Original quantitative learning practice in English. All 24 questions are included. Four supplied cases exercise six related calculation targets; they form one topic, not four separate tests. Every question includes the complete initial data. Use the stated model and retain intermediate precision. Choose one answer. Learning target: 20/24, not an official pass mark. This bank covers the calculation topic in its title; it is not a complete professional examination, design approval or operating instruction.
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A teaching flow collects 15 L in 35 s through a uniform circular section of internal diameter 30 mm. Use π=3.1416, 1000 L=1 m³, and mean velocity=volumetric flow/area. Assume steady incompressible flow. A separate tank holds 250 L. Do not use this model to size a real installation. Calculate the flow in L/s. Keep intermediate values unrounded; round the final result to four decimal places if necessary.