Try to solve this riddle mentally.
A doctor gives you five tablets and tells you to take one every half an hour.
How long will the tablets last?
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Answer: 2 Hours.
Say if starts having the tablet at 10:00 am.
Tablet 1: 10:00
Tablet 2: 10:30
Tablet 3: 11:00
Tablet 4: 11:30
Tablet 5: 12:00
hence the answer is 2 hours.