Ni-like and Co-like X-ray resonance line spectra are simulated between 16 angstrom and 32 angstrom emitted from silver plasma using Nd:YAG laser and its second, third and fourth harmonies for double pulse configurations. In addition to spectral fines, X-ray intensities obtained from free-bound and free-free continuum emission from Zn-, Cu-, Ni-, Co- and Fe-like ions are calculated between 1 angstrom and 30 angstrom. The intensity for 280 ps pre-pulse is 5.4 x 10(12) W/cm(2) and for 1.2 ps short pulse is 4.4 x 10(15) W/cm(2). The time difference between pre-pulse and short pulse is varied between 150 ps and 750 ps. X-ray energy conversion efficiencies and X-ray pulse durations are calculated from X-ray spectra. For example, maximum X-ray energy conversion efficiency for 750 ps time difference is obtained as 0.54 % for fundamental harmonic Nd-YAG laser, 1.01 % for second harmonic, 1.46 % for third harmonic, 1.86 % for fourth haxmonic over 2 pi sr. The ratio of Co-like 3d -> 4f and Ni-like 3d -> 4f resonance line intensities is calculated to determine electron temperature.