Question: An infectious disease starts at a node x in a weighted, directed graph. The time it takes to spread along an edge is equal to

An infectious disease starts at a node x in a
weighted, directed graph. The time it takes to spread along an edge is equal to
the weight of the edge. At the same time as the disease is released, we release an
antidote at another node x != y. The antidote moves along the graph just as the
disease does.

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