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Full adder

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Time taken in a ripple carry adder is = (n-1)*time to propagate carry + time of a single full adder.[if carry propagate time<sum generate time]

=3*20+40

=100ns.
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This is 1- bit rca
So time at which carry bit becomes available    
Tcarry=n*tpd(carry)
=1*20=20 ns
And time at which output sum bit becomes available Ts= (n-1)*tpdcarry+tpd(sum)
                     =0*20+40=60ns

So total propagation delay in ripple carry adder=Tcarry+Ts=20+40=60ns
60 is right answer
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