Question 1152511
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Letha walked s feet away at y feet per minute and arrived at the library 10 minutes late. How fast should she have walked to arrived on time?
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Not sure this is best approach
not sure I understand the description correctly but,..


y, speed as done
y+k, some wanted higher speed
s, distance to get to library

<pre>
            SPEED    TIME    DISTANCE

LATE           y      s/y       s

ON TIME       y+k     s/(y+k)   s

DIFFERENCE             10
</pre>
WANT TO KNOW {{{y+k}}}


{{{s/y-s/(y+k)=10}}}

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Solving for {{{y+k}}},


{{{(sy)/(s-10y)}}}--------the normal speed