Quote:

Originally Posted by **xpi0t0s**
I know we have a winner but here's another approach...

Using a few trials work out what angle you have to hold the 4 minute one at for it to time **exactly **2 minutes. *<obvious after this, so skipped>*

Nice approach. But, I fail to understand how you measure "exactly 2 minutes" !! HOW ?! If you have a watch or something to measure "exactly" two minutes, then why go through all this at all ?? Your 7 mins hourglass can't help you too because 2/7 is not something you can "exactly" measure with naked eyes.

Kindly explain your approach "more" clearly. .... To be specific, please explain how you measure "exactly" 2 mins after a few trials ?!