Can you please help me with the following questions? I had posted this before, but the answers given were wrong. The wrong answers given before for the first one was 125 MHz and for the second one was 2 flip flops. I have one more attempt left for these questions, so please give the correct answer and how you got it. Thank You!

A circuit has a hold time of 8ns and a setup time of 4ns. What is the maximum speed the clock can run to support these times (in MHz)? Round your answer to 3 significant figures Answer: How many Flip-Flops are needed to build enough Registers to fully utilize a MUX with a 3 Bit selector if the Register width is 16 Bits