Question 1205546
This is the information that can be arranged from the problem description; and the constant speed for the first part is unknown, x.
<pre>
                                  SPEED                 TIME              DISTANCE

Constant Rate                     x                                       525

Reduced Speed                    x-30                                      45

TOTAL                                                      8
</pre>

Use that to fill other information.
<pre>
                                      SPEED                 TIME              DISTANCE

Constant Rate                        x                      525/x                 525

Reduced Speed                         x-30                 45/(x-30)              45

TOTAL                                                          8
</pre>
Solve this equation:   {{{highlight_green(525/x+45/(x-30)=8)}}}