GRE Exam Verbal Ability Miscellaneous

number theory,fractions,sp,cp,profit and loss,percentage.

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GRE Other Question

Anything related to GRE. Jeff takes 20 minutes to jog around the race course one time, and 25 minutes to jog around a second time. What is his average speed in miles per hour for the whole jog if the course is 3 miles long?