Question 1160090
<pre>
           SPEED             TIMEin hours    DISTANCE

BIKE         r               {{{3/4}}}             d

CAR          r+4.5           {{{1/3}}}             d
</pre>
The same distance whichever vehicle used.


{{{(r)(3/4)=d=(r+4.5)(1/3)}}}


{{{(r)(3/4)=(r+4.5)(1/3)}}}

Simplify and solve this for r.


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3.6 mph for bicycle