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Number Puzzle #02- Flat Tire -

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Puzzle Image An old car travelling from Los Angeles to San Diego cruises at a speed of 21 miles per hour. After reaching San Diego, the car immediately does a u-turn and returns to Los Angeles at a speed of only 3 miles per hour (courtesy of a flat tire).

What is the car's average speed over the entire journey?
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?