This math topic focuses on calculating average speed involving a return trip. The problems require determining the total distance and total travel time for a car traveling to a town and back to calculate its average speed. Each problem prescribes different distances and durations for the outward and return journeys, enhancing the complexity and testing the ability to manipulate the basic speed, distance, and time relationship in various practical scenarios.
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A car drives to a town 90 km away and then returns. It takes 1 hr to get there and 3 hrs to get back. What's its average speed in km/hr?