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A sports competition will be held on this Sunday. Some competitions start at the following times:

8:00 am, 8:50 am, am, 10:30 am, 11:20 am

(1)   Fill in the blank with the time pattern.

(2)   Tom has two competitions at 8:50 am and 10:30 am. If he finishes the first competition at 9:40 am, how much time does he have before his second competition? min

(3)   What’s the interval between the competitions? min