Question 1072531
.
<pre>
Let W be the distance (in kilometers) he walked.


Then the distance he cycled is (28-D) kilometers.


The time walking is {{{W/5}}} hours.
The time he cycled is {{{(28-W)/11}}}.


Your equation is

{{{W/5 + (28-W)/11}}} = 5.


To solve it, multiply both sides by 55 (LCD = 55). You will get

11W + 5*(28-W) = 5*55,

11W + 140 - 5W = 275,

6W = 275 - 140 = 135  --->  W = {{{135/6}}} = 22.5.


<U>Answer</U>.  He walked 22.5 kilometers.
</pre>

Solved.