I assume this is a design ...

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I assume this is a design question? If this is an existing system you can't solve it - as others have indicated, you need two terms to solve Q=VA for the third term. And that assumes the pipe is filled.

If this is a design problem, you need to determine if this is a pipe flowing full, such as a force main, or a partially full pipe, such as a gravity sewer. There are different procedures for each.