pieces picked per hour
 

I am trying to calculate the pieces my employees are picking in a hour. the system we use will not calculate it and I have to do this 1 pick ticket at a time.

the data I have available is

the time they started/ended a pick ticket in hour and minute of day format 6:03/6:33 and the number of pieces that they pick (61) which would turn into 122 pieces in an hour as the picked 61 pieces in 30 minutes.

how do I make a formula that will do the calculating for me and how should I format the cells?