Question 1050721
RT=D basic rule

"same time", so maybe equate expressions for time


<pre>
r, unknown speed of motorcycle
k, 10 mph
t, unknown same amount of time
D, 312 miles
d, 272 miles
</pre>
<pre>
                  SPEED         TIME         DISTANCE
CAR               r+k           t            D
MCYCLE            r             t            d
</pre>

Two equations can be setup, but you will be solving  {{{highlight(D/(r+k)=d/r)}}}.