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?
One hour. You take the first pill, then wait a half hour and take the second pill, then at the hour mark you take the third and last pill.
1 pill per 30 mins
3 total pills
30 mins times 3 pills = 1 hour and 30 mins
It would take one hour and 30 minitutes before all the pills would have been taken.