At a certain college there at 300 science majors 500 engineering majors 200 music majors and 700 business majors if one student was select at random what is the probability that the student is a music major

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.