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.

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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(52786) About Me  (Show Source):
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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. highlight%28Find_the_speed_of_the_current%29.
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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  speed = Distance%2FTime  for Olivia's trip against the current is 

4 - v = 5%2F2.5,   or

4 - v = 2.

Therefore, v = 2 km%2Fh is the current' speed.

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