The range of set scores is found by subtracting the lowest score from the highest. the range set scores is 52, and the lowest score is 46. find the highest score

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.