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Can anyone explained me how gate delay is calculated in this link http://iitkgp.vlab.co.in/?sub=38&brch=120&sim=483&cnt=664

According me for 32 bit ripple carry adder,

gate delay = (32-1) Pcarry  +   Psum

Now Pcarry = 1-EXOR + 1-AND + 1-OR = 3 gate delay

and Psum = 1-EXOR + 1-EXOR = 2 gate delay

so gate delay = 31*3 + 2 = 95 but given is 65

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