Kenny can row 4 mph in still water. He rows 12 miles downstream on the Yellow River and returns upstream in a total of 8 hours. Find the speed of the current.
You need to have the speed that the river flows. If he's rowing 12 miles downstream it will take him 12/(4mph + river speed) [hours] If he's rowing 12 miles back up stream it will take him 12/(4mph - river speed) [hours]
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