Is this word problem solvable?

[nightwood]

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A canoeist is traveling upstream. 2 miles later he comes across a log going the opposite way.He travels for another 1 hour then turns around. He gets to his starting point the same time the log does. What is the speed of the stream?

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Having trouble coming up with this solution. Any help would be appreciated.

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The speed of the river is one mile per hour. The speed of the canoeist is not important (and cannot be determined). If anyone's interested I'll explain.