20 pts a string is tied to the top of a plant to keep it stabilized. the plant is 5 feet tall and the string is connected to the ground 2 feet from the base of the plant. how long is the string?

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.