SOLUTION: Pamela requires 3 hours to swim 15 miles downstream in the illinois river. The return trip upstream takes 5 hours. Find Pamela's average speed in still water. How fast is the curre
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Question 317902: Pamela requires 3 hours to swim 15 miles downstream in the illinois river. The return trip upstream takes 5 hours. Find Pamela's average speed in still water. How fast is the current?( assume that Pamela's speed is the same in each direction)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Pamela requires 3 hours to swim 15 miles downstream in the illinois river.
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time = 3 hrs; distance = 15 miles ; rate = d/t = 15/3 = 5 mph
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The return trip upstream takes 5 hours.
time = 5 hrs; distance = 15 miles ; rate = 15/5 = 3 mph
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Find Pamela's average speed in still water.
How fast is the current?( assume that Pamela's speed is the same in each direction)
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Let her swim speed be "s":
Let the current speed be "c";
Equations:
Down stream: s + c = 5 mph
up-stream::: s - c = 3 mph
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Add the two equations and solve for "s"
2s = 8 mph
s = 4 mph (Pamel's speed in still water.
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Since s+c=5, c = 1 mph (speed of the current)
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Cheers,
Stan H.
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