hwo to solve this problem with standard normal distribution

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hwo to solve this problem with standard normal distribution
Research has shown that the times taken for walkers to complete a track through a particular
national park are normally distributed with a mean of 3.6 hours and a standard deviation of
0.5 hours.
Calculate the probability that a randomly selected walker will take less than 3 hours to complete the
track.

A friend of mine work it out for me,it's 1/6,I am not sure.I wonder why don't you ask the question in Chinese.Okay,I'll translate it into Chinese for you and someone who good at math but English.
调查显示,徒步穿越一个特殊的国家公园一般需要3.6h,此结果有0.5h的误差.计算随机挑选一个徒步者其穿越该公园耗时低于3h的概率.

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