Final answer:
The question asks for the comparison of speeds of three unidentified runners, but the provided scenarios only give insights into the relative velocities of two runners in a marathon and some average speed data for marathon runners. Without specific distances and times for Runner 1, Runner 2, and Runner 3, it is impossible to determine who is faster per kilometer.
Step-by-step explanation:
To determine the runner with the faster time per kilometer, we need to calculate the velocity or speed of each runner with the information provided. The subject question does not provide explicit times or distances run by the runners in question, however, it lists several related scenarios which discuss runners and their speeds at various points within a race.
From scenario 54, we can calculate the velocity of the second runner relative to the first, which is given by subtracting the velocity of the front runner from the velocity of the second runner: 4.20 m/s - 3.50 m/s = 0.70 m/s. This means that the second runner is gaining on the first runner by 0.70 meters every second.
From scenario 29, we can find out the average speed of a marathon runner who completed a 42.188 km course, which gives us an understanding of a typical marathon speed. However, since the question asks to compare runners' speeds within the same race, this scenario does not help us determine the faster runner between Runner 1, 2, or 3.
Without specific data on the times or distances run by Runner 1, Runner 2, and Runner 3, we cannot conclusively determine who among them was quicker per kilometer.