1. A fast-food trainee takes the hour to make his first 20 sandwiches, 45 minutes for the second 20, and 38 minutes for third 20. Determine his production rate be after 24 hours of experience?
2. New bank clerk require an hour to encode his first 500 checks, 51 minutes for second 500, and 46 minutes for the third 500. Determine after how many batches of 500 checks will he be able to work at standard rate of 1,000 checks per hour?