SOLUTION: Adam drove a boat for 3 hours against a 5mph current. He drove back in 1 hour. How fast would he be driving in still water.

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Question 624902: Adam drove a boat for 3 hours against a 5mph current.
He drove back in 1 hour. How fast would he be driving in still water.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Adam drove a boat for 3 hours against a 5mph current.

He drove back in 1 hour. How fasthighlight%28r%29 would he be driving in still water.

Question states***  Note:  D = rt and distance up and back the same.

  %28r-5mph%29%2A3hr+=+%28r%2B3mph%29%2A1hr   |solve for r in mph  (2r = 18,  r = 9mph)