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In still water a boat averages 18 miles per hour. it takes the same amount of time to travel 4 miles downstream, with the current, as it does 2 miles upstream, against the current, what is the rate of the water current

 Mar 11, 2020
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(18 + c )t  =4     18t + ct = 4

(18-c) t = 2        18t - ct  = 2     add together

                          36t = 6       t  =  6/36   = 1/6 hr

 

(18 + c) ( 1/6) = 4

   3 + 1/6  c = 4

                c= 6 m/hr

 Mar 11, 2020

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