It is currently 7:16 PM. At what time in the morning was it exactly 19,443 minutes earlier?	Choose the correct choice from the following answers:
A) 7 : 11  B) 7 : 13  C) 7 : 17  D) 7 : 19  E) 7 : 21

Rationale: converting 19,443 minutes to hours , we get 19,443 / 60 = 324 r 3 ; that is 324 hours and 3 minutes . all of the answers are during the same hour of the morning , thus the hours can be assumed to bring us into the 7 am hour evenly from 7 : 16 pm . thus 324 hours ago was 7 : 16 am . take an extra 3 minutes off , and it was 7 : 13 am . b
Answer: B