Computer engineering digital systems

The two time-varying signals (A and B) shown below are applied to a real two-input NOR gate. Assume that t_1 = 0, t_2 = 1000 ps, and the gate delay is 250 ps. Obtain the output waveform (Y). Convert a 3-input XNOR gate to a 2- input XNOR gate. Draw a switch diagram for a three-input CMOS NAND gate when the inputs are A1 A2 A3 =1 0 1