Question 1207696
{{{SPEED*TIME=DISTANCE}}}

Not given the distances exactly

<pre>
                  SPEED    TIME            DISTANCES

FIRST HALF          2        d/4              d/2

LAST HALF           7        d/14             d/2

FULL                      d/4+d/14            d
</pre>

Basic Rule means {{{SPEED=DISTANCE/TIME}}}.


{{{d/(d/4+d/14)}}}, easily simpliable.


{{{1/(1/4+1/14)}}}


{{{(28/28)(1/(1/4+1/14))}}}

{{{28/(7+2)}}}

{{{28/9}}}


{{{highlight(3&1/9)}}}


(check for possible mistakes.)