Six boys share a flat with two bathrooms which they use every morning beginning at 7:00 o'clock. In each bathroom there is never more than one person at any one time. The times they spend in the bathroom are 8, 10, 12, 17, 21 and 22 minutes.
What is the earliest time that they can finish using the bathrooms?
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Grey Kangaroo 2014 (2014)
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