SOLUTION: Olivia paddles her kayak a average of 4 kilometers per hour on still water. she paddles against the current of a river for 5 kilometers, and it takes her 2.5 hours.

Question 1027451: Olivia paddles her kayak a average of 4 kilometers per hour on still water. she paddles against the current of a river for 5 kilometers, and it takes her 2.5 hours.
Answer by ikleyn(52790) (Show Source): You can put this solution on YOUR website!
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Olivia paddles her kayak a average of 4 kilometers per hour on still water. She paddles against the current of a river
for 5 kilometers, and it takes her 2.5 hours. .
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Let v be the speed of the current.
Then Olivia's speed floating against the current is (4 - v) kilometers per hour.

Hence, the equation   =   for Olivia's trip against the current is 

4 - v = ,   or

4 - v = 2.

Therefore, v = 2  is the current' speed.

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