speed of a stream : PS Archive
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# speed of a stream

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Intern
Joined: 23 Sep 2009
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23 Sep 2009, 11:38
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A boat crossed a lake from North to South at the speed of 4 km/h, entered a river and covered twice as much distance going upstream at 3 km/h. It then turned around and stopped at the south shore of the lake. If it averaged 3.8 km/h that day, what was its approximate downstream speed?

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Manager
Joined: 04 Sep 2009
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Re: speed of a stream [#permalink]

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23 Sep 2009, 12:29
5 - the topic already covered speed-83800.html

using search helps
Re: speed of a stream   [#permalink] 23 Sep 2009, 12:29
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