help needed on word problems (urgent)

Crystal has a running course marked out for her daily run. She starts this run by heading due north for one mile. She then runs northeast for one mile, then southeast for one mile. The last portion of her run takes her on a straight line back to where she started. How far, in miles, is this last portion of her run? answer is root 3

Tony works two hours a day and is paid $0.50 per hour for each full year of his age. During a six month period tony worked fifty days and earned $630. How old was Tony at the end of the six month period?

Answer is 13

Could someone show me how to get the answers?

Vicky.