Question 326162
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ d\ =\ rt]


Therefore:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ t\ =\ \frac{d}{r}]


Let *[tex \Large r_p] represent the average speed that a person can paddle for the length of time it takes to travel the 69 miles.  Let *[tex \Large r_c] represent the speed of the current in the river.  Then the total downstream speed is *[tex \Large r_p\ +\ r_c] and then our time formula becomes:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ t\ =\ \frac{69}{r_p\ +\ r_c}]


Where *[tex \Large r_p] and *[tex \Large r_c] are expressed in miles per hour.


Just plug in the average paddling speed and the speed of the current and then do the arithmetic.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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