A $7\mathrm{.}0$ cmcm diameter horizontal pipe gradually narrows to $4\mathrm{.}5$ cmcm $.$ When water flows through this pipe at a certain rate, the gauge pressure in these two sections is $32\mathrm{.}5$ kPakPa and $25\mathrm{.}4$ kPakPa $,$ respectively.

Part A

What is the volume rate of flow?

Express your answer to two significant figures and include the appropriate units.