Posted by iris on Tuesday, November 29, 2011 at 11:38am.
Jim ran for 4 minutes at 400m/min.
his distance when Joe started was thus 1600m
Joe and Jim then both ran for 10 minutes, and Joe ended up running the same distance as Jim, who had run an extra 4000m.
If Joe's speed is x m/min, then
1600 + 4000 = 10x
560 = x
So, Jim ran 1600 + 4000 m = 5600 m
Joe ran 560m/min * 10 min = 5600 m
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