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by lion147 » Sun Jul 13, 2008 6:35 pm
I did it differently to the rest:

2,880,717 = 2400000 + 480000 + 600 + 60 + 57

57 is the only number not divisible by 60 (i.e. one whole hour), so the answer will be 60-57=3 minutes later than than the current minute as you're going back in time.

This only works when the answers are close together like these are.
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Insanity

by evansbd » Tue Jul 15, 2008 12:03 pm
Who figured this out in approximately 2 minutes?
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Re: Insanity

by parallel_chase » Tue Jul 15, 2008 12:22 pm
evansbd wrote:Who figured this out in approximately 2 minutes?
You can do this problem in less than 10 seconds.

Method:

if we have to calculate time 10 minutes before 6:27, it will be 6:17

Similarly,

if 5 minutes, then 6:22
if 15 minutes, then 6:12
if 25 minutes, then 6:02,


Therefore we only have to look at the unit digit to find the answer.

The unit digit is 7, any option with 0 at the end will be the answer.

Hence D.
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