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why the answer is selected as 12 and why 19.2 .what are the cases ....please explain.

 A half adder is implemented with XOR and AND gates. A full adder is implemented with  two half adders and one OR gate. The propagation delay of an XOR gate is twice that of an AND/OR gate. The propagation delay of an AND/OR gate is 1.2 microseconds. A 4-bit-ripple-carry binary adder is implemented by using four full adders. The total propagation time of this 4-bit binary adder in microseconds is

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