Efficient method of finding a percentage of time
<p>Is there an efficient method of calculating the percentage of X from Y, when both data types are <code>TimeSpan</code>?</p>

<p>Eg, a basic question would be that <code>1:00:00</code> is 50% of <code>2:00:00</code>.
What would be an effective method of calculating what percentage is <code>00:34:23</code> of <code>4:12:31</code>?</p>
