At 9:10, the cinema started to show movie A with a duration of 92min. Movie B with a duration of 87min started to show at 9:35, and movie C with a duration of 117min started to show at 9:52. If two films were shown at the same time, staff were required to sell popcorn. What is the proportion of time between 9:00-11:00 when the staff need to sell popcorn?
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正确答案: D