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05-10-2017
Mathematics

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A paddle boat can move at a speed of 14 km/h in still water. The boat is paddled 4 km downstream in a river in the same time it takes to go 2 km upstream. What is the speed of the river?

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05-10-2017

1.20/(14+x) =10/(14-x) 2.20(14-x)=10/(14+x) 3.280-20x=140+10x 4.140=30x 5.x=14/3

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