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#1
10-26-2006, 06:08 PM
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Not probability but ...
Here's a simple question from a basic algebra class that is giving me a tough time.
A barge moves 7 km/h in still water. It travels 45 km up river and 45 km down river in a total of 14 hours. What is the speed of the current? Can you not only solve but describe the set up as well? Thanks in advance. -dp 
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#2
10-26-2006, 06:44 PM
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Re: Not probability but ...
[ QUOTE ]
Here's a simple question from a basic algebra class that is giving me a tough time. A barge moves 7 km/h in still water. It travels 45 km up river and 45 km down river in a total of 14 hours. What is the speed of the current? Can you not only solve but describe the set up as well? Thanks in advance. -dp [/ QUOTE ] d = distance, r = rate, t = time d = r*t t = d/r If c is the speed of the current, the boat moves at a rate of 7+c downstream, and 7-c upstream. Use the above equations to write an expression for the upstream time plus the downstream time, and set this to 14 hours. Solve for c. You should get 2 km/hr.
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