Vanderlei Lamb and the Marathon
Being x the total distance of the route, we can say that Vanderlei had already traveled (2/5) * x.
As there were still 40km to reach halfway (x / 2), we can form the following equation:
x / 2 = (2/5) * x + 40
Calculating the least common multiple, we have:
5x / 10 = (4x + 400) / 10
5x-4x = 400
x = 400
Answer: The total distance was 400km.
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