gwartney international someone, question, liability, only

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Please refer to Question 3 on P432 in Volume 2. (Q3 of EOC questions in Reading 20)

1-What is liability duration? I thought that liability duration was an indicator of the maturity of a plans liabilities. How can gwartney have a liability duration of only 10 years and at the same time have a young workforce?

2- Can someone please explain question 1 to me. The explanation is still confusing.