It takes 1 hour * 3 = <<1*3=3>>3 hours for Mark to get to the national park.
The extra time it takes Mark to get to the national park is 3 hours - 1 hour = <<3-1=2>>2 hours
Mark should leave his home at 11 a.m. - 2 hours = <<11-2=9>>9 a.m.
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