how to use the_excerpt for two post queries?

function excerpt($limit) {
$excerpt = explode(' ', get_the_excerpt(), $limit);
if (count($excerpt)>=$limit) {
array_pop($excerpt);
$excerpt = implode(" ",$excerpt).'...';
} else {
$excerpt = implode(" ",$excerpt);
}   
$excerpt = preg_replace('`\[[^\]]*\]`','',$excerpt);
return $excerpt;
}

write below code in your template.

<?php echo excerpt(25); ?>