Suppose the edges of a graph represent streets that must be salted after a snows

Question

Suppose the edges of a graph represent streets that must be salted after a snowstorm. To eulerize the graph, four edges must be added. The real-world interpretation of this is that four new streets would be built. four streets will not be salted. four streets will be traversed twice. Suppose the edges of a graph represent streets that must be salted after a snowstorm. To eulerize the graph, four edges must be added. The real-world interpretation of this is that four new streets would be built. four streets will not be salted. four streets will be traversed twice.

Explanation / Answer

For the street network, draw a graph that would be useful for routing a snow clearing machine. Now to clear the snow it might be a case that each street has to be done twice to clear all the snow. Also, the roads may be one way at each edge so it would require at least two rounds on each edge to clear the snow on both sides of the road. Therefore, option C which says four streets will be traversed twice could be a good answer.

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