He will complete his work at 2:45 pm.
First find the total amount of time it will take to go through 5 such work pieces:
= (time taken for cutting + time taken for molding) x total number of work pieces
= (8 + 13) x 5
= 105 minutes
In hours this is:
= 105 / 60
= 1 hour 45 minutes
Add this to the time he started which is 1 pm
= 1pm + 1 hour 45 minutes
= 2:45 pm
He will complete his work at 2:45 pm.
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