Liangliang plans to travel to the National Forest Park on Sunday. His home is 20 kilometers away from the park. He starts from home at 8:00 and travels 5 kilometers per hour. How long will it take him to arrive?
亮亮打算星期日到国家森林公园去旅游．他家距公园有20千米，他8：00从家出发，每小时行5千米，多少时能到达．
<result>12</result>