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You're being conned! To travel a total of 20 km at 80 kph would take 15 min. You've already taken 15 min to cover 10 km at 40 kph.

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Q: Here is a problem solving question in my workbook. The first 10km you travel at 40 km per hour. At what speed do you have to be at for the next 10km to get an average of 80km per hour?
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