$1.$ A$)$ For a digital circuit with a flip flop with a set up time of $20$ns$,$ hold time of $20$ns$,$ a clock to q time of $40$ns and a combinational delay of $30$ns$.$ What is the minimum clock period $($in nanoseconds$)?$

B$)$ For the above question, what is the frequency associated with the minimum clock period $($in Megahertz$)?$