Time is of the Essence

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The post office sent a motorcyclist to meet a plane at the airport. The plane landed before time, and its mail was taken toward the post office by jeep. After half an hour the jeep driver met the motorcyclist on the road and gave him the mail. The motorcyclist returned to the post office 20 minutes before he was expected. How many minutes early did the plane land?

20 50 30 40

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