Consider the graphed function.
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Speed is the rate of distance over time.
<em>The speed of the boat is 13mph south-west</em>
Given
<em /><em> --- west</em>
<em /><em> -- south</em>
<em />
The speed is illustrated with the attached image
Because both speeds act at a diagonal, the speed (v) of the boat is calculated using Pythagoras theorem as follows:
Take square root
<em />
<em>Hence, the speed of the boat is 13mph south-west</em>
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