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" Let x = the rate of the boat in still water in miles per hour, and y = the rate of the current in miles per hour. Then 36 = 3, x + y or x + y = 12; (I) and ^ = 3, or x - y = 8. "
First Course in Algebra - Page 170
by Herbert Edwin Hawkes - 1910
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College Algebra

Webster Wells - Algebra - 1890 - 560 pages
...rate in miles per hour of the current, and of the crew in still water. Let x = the rate of the crew in still water in miles per hour, and y — the rate of the current in miles per hour. Then, x + y = the rate of the crew in miles per hour rowing down stream, Since the number of miles rowed,...
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