title: Add minutes from another column to string time column in pyspark
body: <p>I have the below pyspark dataframe.both are string columns.</p>
  <pre><code>time     additional_time_in_mins
  11:00:00 60
  13:00:00 60
  14:00:00 30
  </code></pre>
  <p>I have to add the minutes in the additional time column to actual time and create an output as below in pyspark.</p>
  <p>Expected output:</p>
  <pre><code>new_time
  12:00:00
  14:00:00
  14:30:00
  </code></pre>
  <p>Is there a way to do this in pyspark</p>