+9 Sloan the sloth crawls at $100$ meters per hour when crawling uphill, $120$ meters per hour when crawling across flat ground, and $150$ meters per hour when crawling downhill. One day, Sloan crawls across the forest floor from a tree stump to a spring, and then takes the same route in reverse to return to the tree stump. What was Sloan's average speed during the entire round trip?
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