PLEASE HELP I have the answers to part a, but I don’t understand part b.

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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.

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2