Ustawienie trzech tagów div w lini

.a {
 width: 200px;
 border: 1px solid;
 height: 40px;
 float: left;
}

.b,.c {
 border: 1px solid;
 width: 40px;
 height: 40px;
 float: left;
}

<div class="a">test 123456</div>
<div class="b">123</div>
<div class="c">123</div>

.a {
 width: 200px;
 border: 1px solid;
 height: 40px;
 float: left;
}

.b,.c {
 border: 1px solid;
 width: 40px;
 height: 40px;
 float: left;
}

<span class="a">test 12345</span>
<span class="b">123</span>
<span class="c">123</span>