You just need to add a class .pull-right. So it will be:
<div class="row">
<div class="col-xs-3">
<img src="image/t.png " class="img-responsive">
</div>
<div class="col-xs-9 ">
<img src="image/b.png " class="pull-right img-responsive">
</div>
</div>
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