the length and breadth of a rectangle are X + 4 cm and 8 cm respectively write down expressions for the perimeter of the rectangle and the length of the side of a square with the same perimeter

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.