If one clerk can process 75 pieces of mail in 2 and 1/2 hours, how long will it take eight clerks to process 1620 pieces of mail if all of them work at this same rate?

Answer 1

75/2.5 = 30

Each clerk can process 30 pieces of mail in an hour.

1620 / (8 * 30) = 6.75 hours

Answer 2

81 hours