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Propagation delay Tp = 20ms

Transmission delay for each packet = 1000*8/10^6 = 8ms

Now each packet needs to be transmitted thrice and has to pass through three links each have one way delay as 20ms.

Here we have 5000B/1000B = 5 packets.

So 1st packet will reach host B after 3*8 + 3*20 = 84ms

2nd packet will start getting transmitted 8ms after the 1st packet started its transmission.

So 2nd packet will reach host B after 84+8= 92ms

Similarly 3rd packet will reach host B after 92+8 = 100ms

4th packet will reach host B after 100+8= 108ms

And finally, 5th packet will reach host B after 108+8= 116ms

So total time required is 116ms.

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