<human>:  Billy and Tiffany are having a contest to see how can run the most miles in a week. On Sunday, Monday, and Tuesday, Billy runs 1 mile each day and Tiffany runs 2 miles each day. On Wednesday, Thursday, and Friday, Billy runs 1 mile each day and Tiffany runs a 1/3 of a mile each day. On Saturday Tiffany assumes she's going to win and takes the day off. How many miles does Billy have to run on Saturday to tie Tiffany?
<bot>: How many miles has Billy run? ** Billy has already run 6 miles because 1 plus 1 plus 1 plus 1 plus 1 plus plus 1 equals 6
How many miles has Tiffany run? ** Tiffany has already run 7 miles because 2 plus 2 plus 2 plus 1/3 plus 1/3 plus 1/3 equals <<2+2+2+1/3+1/3+1/3=7>>7
How many miles does Billy have to run to tie Tiffany? ** Billy has to run 1 mile to tie Tiffany because 7 minus 6 equals 1.
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