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A driver sets out on a 20 mile trip at halfway he has averaged 25mph at what speed must he travel the rest of the way to make his average speed for the trip 40mph?
Stooks22
If average for whole trip is 40mph, the trip will take 30 mins. If he has done 10 miles at 25mph this will have taken 10/25 of one hour = 24 mins, so he has 6 mins left to do 10 miles. This requires a speed of 100mph.
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∙ 15y ago
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