Answer:
b)3.5km per hour
Explanation:
a) 4km an hour
b) 3.5km an hour
Step-by-step explanation (only for b):
The answer is 3.5 kilometers because if he walked 28 kilometers in 8 hours, that means he walked an average of 28/8 km in 8/8 hours, or 3.5 kilometers in 1 hour.
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