SOLUTION: In a 28 km marathon, Mike completes the race while Nathan is 4 km behind the finish line, and Oliver is 6 km behind Nathan. The number of kilometers Oliver must still run when Nath

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Question 1095743: In a 28 km marathon, Mike completes the race while Nathan is 4 km behind the finish line, and Oliver is 6 km behind Nathan. The number of kilometers Oliver must still run when Nathan finishes is
Answer by greenestamps(13203) About Me  (Show Source):
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In the time that Mike runs the full 28km, Nathan runs 24km, and Oliver runs 18km. Comparing those distances for Nathan and Oliver, we can see that Oliver runs 3/4 as fast as Nathan (18/24 = 3/4).

When Nathan finishes the full 28km, Oliver will have run 3/4 of 28km, or 21km; so he still has 7km to run when Nathan finishes.