Answer:
Duration is 11 years
Step-by-step explanation:
The Duration of a zero coupon bond is equal to it's maturity. Since it matures at 11 years the duration of the bond is therefore also 11 years.
It is a bond that pays no interest. A zero-coupon bond is a bond where the face value is what is repaid during the time of maturity. There are no periodic interest payments, or have so-called coupons, that is why they are referred to as zero-coupon bond. Investor gets par value when it matures.