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by Anamaiy » Wed Aug 10, 2011 10:21 pm
If it is 6:27 on in the evening on certain day, what time in the morning was it exactly 2,880,717 minutes earlier ?

(A) 6:22
(B) 6:24
(C) 6:27
(D) 6:30
(E) 6:32
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by Anurag@Gurome » Wed Aug 10, 2011 10:40 pm
Anamaiy wrote:If it is 6:27 on in the evening on certain day, what time in the morning was it exactly 2,880,717 minutes earlier?
Without going into detailed calculations we can solve this problem just by looking at the options.

Time now is 6:27. So when we go back a huge amount of minutes which ends with 7, the time then should end with 0. Thus, only feasible option is 6:30

The correct answer is D.
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by gmatboost » Thu Aug 11, 2011 7:32 am
If you do want to look at the number of minutes, split it into two pieces:

2,880,000 and 717

2,880,000 minutes = 2,880,000/60 hours
2,880,000/60 = 288,000/6 = 144,000/3 = 48,000 hours
48,000 hours = 48,000/24 days
48,000/24 = 2,000 days

So, that part does not change the time, since it is an exact number of days.

717 minutes is 3 minutes less than 720 minutes, which is 12 hours. So, we should go back 12 hours, then add back 3 minutes. We get [spoiler]6:30.[/spoiler]
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