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A boat moves at a rate of 10 mph in still water. If the​ river's current flows at a rate of 3 mph, how long does it take the boat to travel 22 miles ​upstream?

 Oct 10, 2018
edited by Guest  Oct 10, 2018
 #1
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The current is against you, so your effective rate is  10 - 3  = 7 mph

 

So

 

Distance / Rate  = Time

 

22 / 7  = Time  =  about 3 + 1/7  hours

 

 

 

cool cool cool

 Oct 10, 2018

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