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A biker rode up a 20 km hill in 2 hours and down the hill in 0. 5 hours without stopping. What was his average speed:.
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A biker rode up a 20 km hill in 2 hours and down the hill in 0. 5 hours without stopping. What was his average speed:.

User Moxy
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(Up) 10 km/hr, (down) 40 km/hr, (total) 16 km/hr
User Ouranos
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