A doctor gives you 5 pills and tells you to take one pill every half an hour How many hours pass until all the pills are taken?

Actually, generally when given a prescription like that, you'll take one on the spot, then the rest after the correct amount of time has passed. So in this case: Take 1 pill to start, then another every half hour. So all the pills will be taken in 1 hour. This theorectical question is sometimes used as a "brain teaser". 1 and a half hours