I need help with the following question 3)If each of these 4 bit adders takes 10

Question

I need help with the following question

3)If each of these 4 bit adders takes 10 nsec and there is a 1 nsec delay between adders, how long will it take two get the result from the 8-bit adder described in question 2?

My solution 4*11-1=43

4) Recalculate question (4), but this time consider that the 4-bit adders are configured as ripple adders

Here is the second question

2. If a particular 4-bit adder contains 20 gates, then how many gates would be required for an 8-bit adder if it utilized these 4 bit adders in a carry select adder configuration?

My answer is 20 gates

not sure if this is correct either

PLease help thanks

Explanation / Answer

Yes all your answers are currect,

these 4 bit adders takes 10 nsec and there is a 1 nsec delay between adders, how long will it take two get the result from the 8-bit adder is:

My solution 4*11-1=43.

4) It requires same number of gates: 20 gates.

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