1/3
1/3
1/3

<div class="row">
    <div class="col-xs flex-xs-top">
        <span>1/3</span>
    </div>
    <div class="col-xs flex-xs-middle">
        <span>1/3</span>
    </div>
    <div class="col-xs flex-xs-bottom">
        <span>1/3</span>
    </div>
</div>