SOLUTION: Bob walks from point A to point B at 6 miles per hour and back at 8 miles per hour.What is his average speed

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Question 357299: Bob walks from point A to point B at 6 miles per hour and back at 8 miles per hour.What is his average speed
Answer by robertb(5830) About Me  (Show Source):
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let c be the distance from A to B (and vice-versa). Then his time of travel from A to B is c/6 hrs. Similarly, his time from B to A is c/8. His total time of travel is then c%2F6%2Bc%2F8+=+7c%2F24hrs. His total distance traveled is 2c. Therefore his average speed is %282c%29%2F%287c%2F24%29+=+48%2F7 miles per hour.