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A professional triathlete competes in an Austin bike race. She takes 1.5 hours to travel the entire course. Her speed varies from 0 kilometers per hour (km/hr), while stopped for a tire change, to 30 km/hr while riding downhill. The illustration shows her trip distances for each section of the race. What is the rider's average speed in km/hr during the 1.5 hour bike race?

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A professional triathlete competes in an Austin bike race. She takes 1.5 hours to travel the entire...

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