A input group with 2 text inputs / demo here: http://jsfiddle.net/rjj0x1sm/
<div class="input-group" id="unified-inputs">
<input type="text" class="form-control" placeholder="Input1" />
<input type="text" class="form-control" placeholder="Input2" />
</div>
#unified-inputs.input-group { width: 100%; }
#unified-inputs.input-group input { width: 50% !important; }
#unified-inputs.input-group input:last-of-type { border-left: 0; }