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Fix to rate_problems_1 to ensure the givens make sense
Summary: Previously one of the distances could be zero, so the given average speed didn't make sense. (How can you have an average speed over zero distance?) This just ensures neither distance is zero. Test Plan: Tested locally outside devappserver Reviewers: stephanie, yunfangjuan Reviewed By: stephanie Differential Revision: http://phabricator.khanacademy.org/D848
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