You have three pills with you which you are required to take one after every thirty minutes.
How long can the pills run for you? Choose one
A) 1 hour  B) 2 hour  C) 3 hour  D) 4 hour  E) None
Solution:   The pills can run for an hour.   Explanation:   If you had ninety minutes in mind, then you are wrong. You took the first pill at the zero minute. Then you took the second pill after 30 minutes and the third pill after 30 + 30 i.e. 60 minutes or an hour   1 hournswer 1 hour
<result>A</result>
You have three pills with you which you are required to take one after every thirty minutes.
How long can the pills run for you?