SOLUTION: if ben drives on a highway 80 miles 30 mi/hr. then back on the same highway, but 40 mi/hr. what is his average rate
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Question 811533: if ben drives on a highway 80 miles 30 mi/hr. then back on the same highway, but 40 mi/hr. what is his average rate
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
if ben drives on a highway 80 miles 30 mi/hr. then back on the same highway, but 40 mi/hr. what is his average rate
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RT time = 80/30 + 80/40 hours
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Avg rate = 160/(RT time)
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If you work that out, you'll find that
avg rate = 2*30*40/(30 + 40)
= 240/7 mi/hr
=~ 34.71 mi/hr
This is true regardless of the distance.
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