How far away is marrietta ga from norcross ga?

22 miles taking this route:

1. Take I-85 SOUTH, from Norcross, to I-285 WEST BYPASS to CHATTANOOGA and BIRMINGHAM off EXIT 95B.
2. Take I-285 around to I-75 NORTH to MARIETTA and CHATTANOOGA off EXIT 20.
3. Take I-75 NORTH to Marietta.