The diagram below shows a network of tracks (represented by edges) between checkpoints (represented by vertices) in a short-distance running course. The numbers on the edges indicate the time, in minutes, a team would take to run along each track.
A challenge requires teams to run from checkpoint `X` to checkpoint `Y` using these tracks.
What would be the shortest possible time for a team to run from checkpoint `X` to checkpoint `Y`? Mark the shortest route on the diagram below. (2 marks)