Help me please I dont get my math?

Okay can anyone help me please can anyone help me or tell me how to or give me the awnsers to this questionits like this : Find the average rate at which person travels during the first three hours these are the persons the first hour jose walked three miles, mario walked 7 miles and melanie walked 9 miles then jose walked 10 miles in the second hour and mario walked 14 miles and melanie walked 18 miles then jose walked 15 in the 3rd hour and mario walked 21 and melanie walked 27 so what is the average rate explain thank you if you can help.