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Answer:
12.5km/hr
Step-by-step explanation:
Distance in 1st hour = 20km
Distance in 2nd hour = 15km
Distance in 3rd hour = 10km
Distance in 4th hour = 5km
Total distance = 50km
Total time taken = 5hr
Average speed = Total distance / Total time
= 50km / 4hrs
= 12.5km/hr
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