Girard owes two debt payments-a payment of $5000 due in six months and a payments of $6000 due in fifteen months. If Girard makes a payment of $5000 now, when should he make a second payment of$6000 if money is worth 11% compounded semi-annually?

The payment should be made ? half-years from now.

(Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.)