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~ Б0ЯИ Τ0 С0δЭ ~
Quote:
Originally Posted by shabbir
So we have a new Winner now.
Yeah, finally !!!!!!
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Mentor
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. Also work out some angles for other times for when some twit goes "OK smart alec, now do N minutes".
Then time 7 minutes with the 7 minute timer and 2 minutes with the 4 minute timer at the appropriate angle.
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~ Б0ЯИ Τ0 С0δЭ ~
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 ?!
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Mentor
With a stopwatch, obviously. Which you'll need anyway, because how else would you know that the 7-minute and 4-minute timers are accurate?
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Invasive contributor
@xpi0t0s
In questions like these you assume that your hourglasses are correct, else by your approach, how do you know your stopwatch is correct too? you assume it to be!
Or consider it that hourglasses were checked with a watch by a 3rd person and given to you...
Hence you cannot have anything else.....
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~ Б0ЯИ Τ0 С0δЭ ~
Quote:
Originally Posted by xpi0t0s
With a stopwatch, obviously.
Oh really, that was quite cunning.

Quote:
Originally Posted by xpi0t0s
Which you'll need anyway, because how else would you know that the 7-minute and 4-minute timers are accurate?
We know that 'cuz he man who sets the questions defines it for us.

You are not expected to use any kind of tricks here like using a stop watch. Simply use the two hourglasses, compare time as nimesh or naimish pointed out and get a measure of 9 min.
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Invasive contributor
Quote:
Originally Posted by shabbir
So we have a new Winner now.
Hi Shabbir, Thank you very much
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Go4Expert Founder
Quote:
Originally Posted by naimish
Hi Shabbir, Thank you very much
The pleasure is all mine