Im new to the Solidworks Gears toolbox feature. How is center distance calculated between two meshing gears. I know they have to have the same module to mesh correctly but how is the center to center distance calculated.

Example.

Based on my Model I need a gear with 57 teeth with a circular pits of around 98 more or less I need it to mesh with a smaller gear 17 teeth around 15 mm circular pitch. How do I go about getting the correct module and center to center distance?