Petra, who can paddle her canoe at a rate of 12 mph in calm water, is paddling her canoe on a river whose current is 6 mph. How long will it take her to travel 3 miles upstream against the current?
Please help
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Basically she's traveling at 6mph (12mph - 6mph). To travel 3 miles at a speed of 6mph, she would need to paddle for 30 minutes
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