title: Sum of Hour and Time value in diffrent column in excel 2010
body: <p>I have an Excel file which contains two columns for hours and minutes, like:</p>
  
  <pre><code>hr |min
  ---+---
   7 |  2
  10 | 16
   9 | 12
  </code></pre>
  
  <p>I would like it to present in additional column as</p>
  
  <pre><code>07:02
  10:16
  09:12
  </code></pre>
  
  <p>How to do that in Excel 2010?</p>