SOLUTION: A family travel 18 miles and returns. It takes 8 hours to make the round trip. their rate in still water is twice the rate of the current. Find the rate of the current.

Question 876290: A family travel 18 miles and returns. It takes 8 hours to make the round trip. their rate in still water is twice the rate of the current. Find the rate of the current.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi

average speed =  = 4.5mph

r = 2c where c is the rate of the current

| |Multiplying thru by 3c so as all denominators = 1

    18 + 54 = 24c

         72/24 = c = 3mph



 

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