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Statistics Question - Normal Probability Distribution

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I need to know how to use the formula to answer these questions.

The time needed to drive from town A to town B is normally distributed with a mean of 180 minutes and standard deviation of 20 minutes. What is the probability that a person will drive from town A to town B in i) three hours or more, ii) in less than 180 minutes, iii) in more than 140 minutes, iv) in exactly three hours, and v) in less than 2.5 hours?

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i) Since 3 hours = 180 minutes, the answer is P(X>180)=P(Z>(180-180)/20)=P(Z>0)=0.5 by using a standard ...

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This solution shows how to use a formula to solve a series of problems.

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