The average speed of the tourist over the time period between midday and 1pm is 25km/h, 25km per hour, or 25km/hr. This can be determined by finding the slope of the line segment graph, which represents the distance vs time. The slope of a distance vs time graph represents the speed, and in this case, the slope is constant at 25km/h. Therefore, the average speed of the tourist over this time period is 25km/h.