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Here i dont understood how they calculated 12ns . I got that the first full adder will take 4.8ns time at that 4.8 ns we'll get the carry as well as the sum, in that duration the first XOR Ai xor Bi will be done for subsequent operands but for final sum the carry first need to be propagated through all full adder first

Why 4.8 + 3*2.4 ??

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Q.A one bit full adder takes 75 nsec to produce sum and 50 nsec to produce carry.A 4 bit parallel adder is designed using this type of full adder. The maximum rate of additions per second can be provided by 4 bit parallel adder......?
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can anyone tell me wat is the right equation for carry generator in carry lookahead adder ?? Confused .. $C_{i} = G_{i}+P_{i}C_{i-1}$ $C_{i+1}=G_{}i+P_{}iC_{}i$