Can someone tell me how to solve a 2 step equation and how to put the answer on a number line? Also, can you tell me how to solve a 2 step inequality and put the answer on a number line? Thanks.

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.