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Algebra
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the excursion boat on the river takes 2 1/2 hours to make the trip to a point 12 miles upstream & to return. If the rate at which the boat travels in still water is 5 times the rate of the river current, what is the rate of the current?

Oct 22nd, 2014

Total distance traveled by the boat = 12 * 2

= 24 miles. (upstream and back)

So, the boat travels 24 miles   in   2 1/2 hours  ? miles     in     1 hour

The rate at which the boat travels

=  24 * 1 / 2.5 = 9.6 miles/hour

Assume the rate of current = x,  

then the rate of travel in still water = 5x 

Therefore, 5x = 9.6 

                  x = 9.6/5 = 1.92 miles/hour

This means that current moves 1.92 miles per hour

Oct 22nd, 2014

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Oct 22nd, 2014
May 26th, 2017
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