Tony rows his canoe 30 miles downstream in the same time it takes him to row 12 miles upstream. If he rows 20mph in still water, what is the speed of the stream?

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Answer 1 · 2016-06-18T03:30:39

#x ~~ 8.57.1#

Let #x# be the speed of the steam.

#30/(20 + x) = 12/(20 - x)#

#30(20 - x) = 12(20 + x)#

#5(20 - x) = 2(20 + x)#

#100 - 5x = 40 + 2x#

#60 = 7x#

#x ~~ 8.57.1#