Question 1016791


<pre>
r      rate in rain
r+5    rate not in rain
RT=D   model for uniform travel rate rule relating rate, time, distance


                   rate         time         distance
While Rain         r                          252
Rain No more       r+6                        144
Total                            9



Fill-in the missing time data:

                   rate         time         distance

While Rain         r            252/r         252

Rain No more       r+6          144/(r+6)     144

Total                            9
</pre>

Form the time-sum equation  {{{highlight_green(252/r+144/(r+6)=9)}}}, and solve this for r.