In the first route, Malcolm spends 6 minutes * 2 = <<6*2=12>>12 minutes walking along the path.
So in total, the first two stages of this route take him 6 + 12 = <<6+12=18>>18 minutes.
This means the final part of the journey took him 18 / 3 = <<18/3=6>>6 minutes.
Therefore, the total time it takes to walk the first route is 18 + 6 = <<18+6=24>>24 minutes.
In the second route, the second stage takes him 14 * 2 = <<14*2=28>>28 minutes.
So the second route takes a total of 28 + 14 = <<28+14=42>>42 minutes to walk.
The second route therefore takes an extra 42 minutes for the second route – 24 minutes for the first route = <<42-24=18>>18 minutes.
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