If you mixed 25ml of .1M kh2po4 with 32ml of .12M k2hpo4 what ions will be present and what is the PH?

I need to know how H2PO4 will react with HPO4 I know that they are both strong acids so my first instinct was to treat one as a strong acid and another as a conjugate base determine the amount of moles of each and use the henderson hlebach equation. I got a PH of 6.29??? I NEED HELP