How long is it to maturity for the following bonds?

\begin{tabular}{c|c|c|c|c|c} Par Value & CouponRate & YearstoMaturity & YieldtoMaturity & Price & CouponPrequency \\ \hline$5,000.00 & 10% & ? & 7% & $6,759.17 & semiannual \\ \hline$1,000.00 & 12% & ? & 10% & $1,154.54 & quarterly \\ \hline$1,000.00 & 7% & ? & 11% & $681.47 & annual \\ \hline$5,000.00 & 5% & ? & 8% & $3,505.57 & monthly \end{tabular}