XSLT set <td> height from variable

XSLT: How can I set height ?

<xsl:variable name="height" select="number(((substring-before(finish_time,':')) - (substring-before(start_time,':'))) * 60 + (substring-after(finish_time,':')) - (substring-after(start_time,':'))) div 30"/>
<xsl:variable name="row_height" select="ceiling($height)"/>
<tr><td height=" ??$row_height??" bgcolor="#E3E5EE">

What should I put in there to set td height to variable rows ?
ZAPASCOAsked:
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zc2Connect With a Mentor Commented:
There is a special syntax:

<td height="{$row_height}" bgcolor="#E3E5EE">
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