'Dependence of data transfer latency on number of target nodes

Suppose some fixed size data is to be transferred between machines. Let us consider two scenarios:

1 target: Data is transferred from machine A to machine B. Suppose this takes x seconds.
2 targets: Data is transferred from machine A to machine B and C. Suppose this takes y seconds.

What can be said about the relationship between x and y? I think usually y should be greater than x. Am I right? Is there any work/paper/blog that gives such an insight?

I think the relationship between x and y should depend on the topology of network connection between the machines too.

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'Dependence of data transfer latency on number of target nodes

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