SOLUTION: a boat takes 3 hours to travel 30 km down a river, then 5 hours to return. how fast is the river flowing?

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Question 668427: a boat takes 3 hours to travel 30 km down a river, then 5 hours to return. how fast is the river flowing?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

a boat takes 3 hours to travel 30 km down a river, 

then 5 hours to return. how fast is the river flowing?

Note:  D/t = r

 r + c = 10  30km%2F3hr

 r - c = 6   30km%2F5hr

 2r = 16

  r = 8   and c = 2kmph, how fast the river is flowing