Based on a poll, 64% of internet users are more careful about personal information. What is the probability that among three randomly selected internet users, at least one is more careful about personal information ?

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.