A bee flies from a petunia to a marigold at an average speed of 3 meters per second. Immediately upon reaching the marigold the bee turns around and flies back to the petunia at an average speed of 6 meters per second, following his original path. What was the bee's average speed for the round trip? 3 meters per second 4 meters per second 4.5 meters per second 6 meters per second

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