Divide 605 miles by 11 hours, which would give you how far he travels in 1 hour. (605/11=55) Since they give you 13 hours, multiply 13 hours by 55 miles which gets you 715 miles :)
A. 1/10000 because it is a 1/100 chance for each. b. 1/100 because there are 10,000 options and 100 of them are the same options. Simplify for the answer.