Question 1146304
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The times are the same; so the ratio of distances is the same as the ratio of speeds:<br>
{{{(r-1)/(r+1) = 8/16}}}
{{{(r-1)/(r+1) = 1/2}}}<br>
You can solve the equation algebraically; however a little insight can lead quickly to an answer.<br>
The difference between the numerator and denominator on the left is 2.  So rewrite the fraction on the right as an equivalent fraction where the difference between the numerator and denominator is 2:<br>
{{{(r-1)/(r+1) = 2/4}}}<br>
That clearly makes r=3.<br>
ANSWER: Ashley's rate in still water is 3km/hr.