It took a boat 2 hours to reach town A going upstream. The way back was 1h20 min. What is the speed of the boat in still water if the speed of the stream is 3 mph?
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Let X = rate of boat in still water. Distance traveled is rate times time, and the distance is the same upstream as downstream. The rate upstream is (X - 3) mph, and down stream is (X + 3) mph. Change time traveled to minutes, and set up the equation to solve for X: 120 (x - 3) = 80(x + 3); 120 X - 360 = 80 X + 240; 40 X = 600, X = 15. The boat is going at a rate of 15 mph if in still water.
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Change time traveled to minutes, and set up the equation to solve for X: 120 (x - 3) = 80(x + 3); 120 X - 360 = 80 X + 240; 40 X = 600, X = 15. The boat is going at a rate of 15 mph if in still water.
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