Point R is located at (2, 4) on a coordinate grid. Point R is translated 6 units to the left and 7 units down to create point S.

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.