a-customer-at-a-cafe-orders-a-coffee-and-the-time-it-takes-for-the-coffee-to-be-

Question

A customer at a café orders a coffee, and the time it takes for the coffee to be prepared is uniformly distributed between $5$ and $15$ minutes. What is the maximum time, in minutes, within which there is a $90 percent sign$ probability the coffee will be ready?

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A customer at a café orders a coffee, and the time it takes for the coffee to be prepared is uniformly distributed between 55 and 1515 minutes. What is the maximum time, in minutes, within which there is a 90%90\% probability the coffee will be ready?

A customer at a café orders a coffee, and the time it takes for the coffee to be prepared is uniformly distributed between $5$ and $15$ minutes. What is the maximum time, in minutes, within which there is a $90 percent sign$ probability the coffee will be ready?