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best city guide and media queries

I tried to solve the layout problem for two and three column layouts with media queries.. and got stuck.. and found solution from the videos..

My layout is different and I notice if you mention the third column in the two col (layout) with one full length col below it the big screen layout duplicates the third col below even thought i tell it to float all three to the left...

The only way around it is to explicitly re mention the column by name in the third 3 col layout and forcing a float to the right and to move it up from sitting below using a clear none rule..

Like this @media (min-width:1025px){

    max-width: 1150px;
    margin: 0 auto;
.primary {
.tertiary {
  width: 30%;
.col {
.tertiary {


unlesss i put in the .tertiary rule, the rule .col float left does not work and it keeps the third col below it as for the smaller screen