SOLUTION: Ted walks from his home to the post office at an average rate of 3 miles per hour. he then runs back at an average rate of x miles per hour. Find x if his average for the entire tr

Question 720545: Ted walks from his home to the post office at an average rate of 3 miles per hour. he then runs back at an average rate of x miles per hour. Find x if his average for the entire trip is 4.5 mph
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
________________speed_______________time________________distance
Walk To_________3___________________(___)_______________3
Run Back________x___________________(___)_______________3
Total___________(___)________________(___)_______________6

Try to fill the time information, because we may want distance divided by total time.

________________speed_______________time________________distance
Walk To_________3___________________()_______________3
Run Back________x___________________()_______________3
Total___________(___)________________()_______________6

The total time is represented as . Note that so far, all units are miles, hours, miles per hour.

We were given average speed for round trip was 4.5 miles per hour, so set this as and solve for x.
Steps continuing could be,

.
and continue as best you know...

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