SOLUTION: if i travel to a shop at 20km/h how fast must i go when i return to get an average speed of 40km/h?

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Question 620407: if i travel to a shop at 20km/h how fast must i go when i return to get an average speed of 40km/h?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
if i travel to a shop at 20km/h how fast must i go when i return to get an average speed of 40km/h?
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