Question 622968
Shelly can row 5mp in still water.  It takes her as long to row 7miles upstream as it does 23 miles downstream.  How fast is the current?
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c = speed
t = 7/(5-c) = 23/(5+c)
7(5+c) = 23(5-c)
35 + 7c = 115 -23c
30c = 80
c = 8/3 mi/hr