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Answer:
6 km/h
Step-by-step explanation:
A polar bear starts at the North pole. It travels 1km South
Total distance traveled so far: 1 km
then 1km East
Total distance traveled so far: 2 km
then 1km North to return to its starting point.
Total distance traveled so far: 3 km
speed = distance/time
speed = 3 km / 0.5 h
speed = 6 km/h