Can someone please give me a good schedule that I could use to when I could study at on a school day? My school ends at 4:00 so what would be a good time to study?

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.