Lea walked 1/2 miles in 1/3 hours. how long will it take lea to walk 2 1/4 miles? enter your answer as a mixed number in simplest form.

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.