Let X represent the amount of time, in minutes, it takes grade school

Let X represent the amount of time, in minutes, it takes grade school kids to eat their lunch. The model for this variable X is uniformly distributed between 10 and 35 minutes, inclusive.What is the probability that a randomly selected grade school kid will take more than 30 minutes to eat their lunch?What is the probability that two randomly selected grade school kids will take more than 30 minutes to eat their lunch?Assuming lunch time is not over yet and a randomly selected grade school kid has already taken 20 minutes eating their lunch, what is the probability that they will take more than 30 minutes to eat their lunch?

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