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Three runners Adam, Ben, and Charles all start at the same time for a 24 km race, and each of them runs at a constant speed. When Adam finishes the race, Ben is 8 km behind, and Charles is 12 km behind. When Ben finishes the race, how far behind is Charles, in km?

 Sep 1, 2021
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When Adam finishes the race, Ben is 8 km behind and Charles is 12 km behind:

Which means: the distance between Ben and Charles is:

12 - 8 ==4 km

So, when Ben finishes the race, Charles is:

4 km behind him.

 Sep 1, 2021

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