14.1. A pedestrian walked a certain distance in 2.5 hours, and during any one-hour interval, he walked 5 km. Can we claim that the pedestrian walked the entire distance at an average speed of 5 km per hour?

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14.1. No, the average speed is not necessarily 5 km per hour. For example, if the pedestrian moves at a constant speed of 3 km per hour during the first, third, and fifth half-hours, and at a speed of 2 km per hour during the second and fourth half-hours, then he will cover 5 km in any one-hour period, while his average speed in this case would be $(3+2+3+2+3)$ km: 2.5 h. $=$ $=5.2$ km per hour.