SOLUTION: the current in the lazy river moves at a rate of 4mph. vlads motors 6 miles upstream in the same time it takes 12 mi downstream. what is the speed in still water?

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Question 855331: the current in the lazy river moves at a rate of 4mph. vlads motors 6 miles upstream in the same time it takes 12 mi downstream. what is the speed in still water?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

what is the speed +highlight_green%28x%29in still water? 

6mi%2F%28x-4mph%29+=+12mi%2F%28x%2B4mph%29

   12x - 48 = 6x + 24

       6x = 72

        x = 12mph

CHECKING our answer***

6%2F8+=+12%2F16+=+3%2F4  Note 3/4 hr is the time it took going up and back, as well.

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