SOLUTION: A man rowed 3 miles upstream in 90 minutes. If the river flowed with a current of 2 miles per hour, how long did the man's return trip take? A)20 minutes B)30 minutes C)45 minut

Question 616514: A man rowed 3 miles upstream in 90 minutes. If the river flowed with a current of 2 miles per hour, how long did the man's return trip take?
A)20 minutes
B)30 minutes
C)45 minutes
D)60 minutes
E)80 minutes
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi, 

A man rowed 3 miles upstream in 90 minutes

Let r represent the rowing r

D = rt OR r = D/t

(r-2) = 3/1.5 = 2

  r-2 = 2

  r = 4mi/hr

With the current, will travel 6mi/hr

 or 30min  

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