A patient was given five pills which he is required to take one after every twenty minutes.
How long can the pills run for him?  Choose the correct option:
A) 1 hour  B) 1 hour 20 minutes  C) 1 hour 30 minutes  D) 1 hour 35 minutes  E) 1 hour 40 minutes
Explanation:   He took the first pill at the zero minute.   He took the second pill after 20 minutes = 0+20= 
<gadget id="calculator">0+20</gadget>
<output>20</output>
20   He took the third pill after 20 minutes= 20+20= 
<gadget id="calculator">20+20</gadget>
<output>40</output>
40   He took the fourth pill after 20 minutes= 40+20= 
<gadget id="calculator">40+20</gadget>
<output>60</output>
60   He took the fifth pill after 20 minutes= 60+20= 
<gadget id="calculator">60+20</gadget>
<output>80</output>
80   Then it will last for 80 minutes or an hour and 20 minutes.   Answer 1 hour 20 minutes
<result>B</result>
A patient was given five pills which he is required to take one after every twenty minutes.
How long can the pills run for him?