title: Conditional sum contigous columns
body: <p>I'd like to sum the total time allocated per task. Time has been provided either in minutes or in hours.
  <a href="https://i.stack.imgur.com/oEeD5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oEeD5.png" alt="screen shoot"></a></p>
  
  <p>For example Task A should be:
   30 minutes + 2 hours x 60 minutes/hour + 150 minutes = 300</p>
  
  <p>What formula should I use on B2 to get such a result, considering that I have many more than 4 people? </p>