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A canoe is paddled at 2.0 km/h directly across a river that flows at 3.0 km/h, as shown in the figure. What is the resultant speed of the canoe relative to the shore?

 
______ km/h
Oct 19th, 2017

Without seeing the figure it's a little tricky, but generally in these problems you can think of the speeds as the edges of a right-angled triangle, and use Pythagoras' theorem to calculate them. So if you paddle across the river at 2km/h and are swept along it at 3km/h, your total speed (going diagonally) will be:

sqrt (2^2 + 3^2) = sqrt ( 4 + 9 ) = sqrt (13) = 3.61km/h.

Mar 3rd, 2015

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Oct 19th, 2017
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Oct 19th, 2017
Oct 19th, 2017
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