If a doctor gives you 3 pills and tells you to take one pill every half hour, how long would it take before all the pills had been taken?

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Answer this question, only if you know the answer. 30 points and brainliest!

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?