The Volume Flow Rate equation calculates the rate at which a volume of a fluid crosses a section of a tube with given velocity and cross-sectional area.

Reference

Young, Hugh and Freeman, Roger.  University Physics With Modern Physics.  Addison-Wesley, 2008. 12th Edition, (ISBN-13: 978-0321500625 ISBN-10: 0321500628 ) Pg 467, eq 14.11