Problem $2(14$ points total; $7$ points per part$)$

What is the delay for the following types of $15-$bit adders? Assume that each two$-$input gate delay is $100$ ps and that a full adder delay is $150$ ps $.$

$($a$)$ a ripple$-$carry adder

$($b$)$ a carry$-$lookahead adder with $5-$bit blocks $($make sure you account for the larger block size!$)$