Need help please. Given a regular decagon, what are the measures of the angles formed by (a) two consecutive radii and (b) a radius and a side of the polygon?
459.225
60°: 240
72°: 198
36" 72

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.