Ian walks 2km to his best friends house, the. Walks. 5km to the library. Then makes a 2.5 km walk home. The entire walk took 3 hours. What is his average speed in km/h?

Average speed = (total distance traveled) / (total time to travel the distance)

Ian's total distance = (2km + 0.5km + 2.5km) = 5 km

Time for the entire walk) = 3 hrs

Average speed = (5km) / (3hrs) = 1.67 km/hr

Average speed = (1 and 2/3) km/hr

1.66 km/h or 1 2/3 km/h