On a hundred km road a car travel the first 50km at a uniform speed of 30km per hour how fast car travel from the next 50km show as to have an average speed of 45km for the interior distances
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average speed 45 = total distance / (t1+t2)
45 = 100/ (50/30+50/x)
solve for X which would come out to be 90
45 = 100/ (50/30+50/x)
solve for X which would come out to be 90
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