If Carrie got 18 out of 20 questions correct on a test what percents was correct

Icould really use some with this question.

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

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.