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SAT difficult question!!!

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Graham walked to school at an average speed of 3 miles an hour and jogged back along the same route at 5 miles an hour. If his total traveling time was 1 hour, what was the total number of miles in the round trip? a) 3 b) 3 and 1/8 c) 3 and 3/4 d)4 e) 5 please help me with the answer and explanation (show me how to answer it!!!) SAT IS IN LESS THAN A MONTH!!! XD