If the answer is something as lame as "typing" the number versus "writing" it, don't make me bust out the awesome power of my tablet PC. Is the key word here "someone"? Just because one person takes a pill every half hour doesn't mean I have to keep the same schedule.
I googled the third one, and it said 1 hour on three different sites, but obviously that's not the answer, since three people already said it. So, either ubigred is either bad at math, or he doesn't understand the concept of a riddle. Unless the prize is a new car, it's not worth it...
I just googled it too. They word it differently saying how long will the pills last. So I'm not sure what it is. Its either 1 hour or however damn long it takes the person to take the 3 pills. But the latter can't be right because he states the person takes the pill once every half hour. If it was the doctor prescribing the pills to be taken every half hour then maybe it would be so. But it has to be one hour. I'm stubborn and thats the answer, regardless of what anyone else thinks.
I see what you mean, but then again, he says "how long would it take..." so, clearly, "it" is not a person.