Question 1058945
Make a data table and then use RT=D basic principle to form the necessary equations.

<pre>
           SPEED       TIME        DISTANCE

SLOW         5         {{{t}}}

FAST         8

Total                  1.1           7
</pre>


You need to fill in the missing cells of the data table.
<pre>
           SPEED       TIME        DISTANCE

SLOW         5         {{{t}}}       {{{5t}}}

FAST         8          x            8x

Total                  1.1           7
</pre>
The additional variable, x for the FAST time is the only way I can see to do this.  You have two sums in the variables, t and x.  They are LINEAR equations forming a system.


{{{system(t+x=1.1,5t+8x=7)}}}, and you should be able to solve this system.