5. Terri rode her bike very slowly to the top of a big hill. Then she coasted back down the hill at a much faster speed. The distance from the bottom to the top of the hill is 3 kilometres. It took Terri 74 hours to make the round trip. What was her average speed for the entire trip? (Hint: What is the round-trip distance?.)
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Answer:
644km
Explanation:
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