Given that Leo hiked 6/7 of a kilometer, while Jericho hiked 2/3 kilometers, to determine who covered a longer distance and how much longer it was, the following calculation must be performed:
Common multiple of 7 and 3 = 21
6/7 = 18/21
2/3 = 14/21
18 -14 = 4
Thus, Leo hiked a longer distance, hiking 4/21 km more than Jericho.
