Waugh jogged to a restaurant at x miles per hour, and jogged back home along the same route at y miles per hour...

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Waugh jogged to a restaurant at x miles per hour, and jogged back home along the same route at y miles per hour. He took 30 minutes for the whole trip. What is the average speed at which he jogged for the whole trip?

1) The restaurant is 2 miles from home
2) x=12, y=6

OA D