A man hiked a distance of 9 miles into the country. He rode back in a car along the same route at the rate of 27 mph. If the entire trip took 3 hours and 20 min, find his rate while walking. Answer:

18miles/3.333hrs=5.40mph avg 

if 9miles took 9/27mph=.333 of the time taken, so then

3 hours were spent walking so 9/3 =3mph walking speed

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