with a 7 minute hourglass and a 11 minute hourglass how would you time 15 minutes? (20)
mellofello6508Pocahontas, Arkansas USA5 Threads 17 Postsgood luck with this one (pretty easy)
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dono------ This thread is Archived ------
Run them both togethor. WHen the 7 minutes runs out filp them both bavk over...when the 4 minutes runs out of the 11, flip the 7 back over.
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flip both over...
when the seven minute one runs out, that is when you start timing...
that would leave 4 minutes in the 11 minute glass...
when it finishes flip the 11 minute back over which is 11 minutes plus the prior 4 minutes = 15 minutes
when the seven minute one runs out, that is when you start timing...
that would leave 4 minutes in the 11 minute glass...
when it finishes flip the 11 minute back over which is 11 minutes plus the prior 4 minutes = 15 minutes
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she's veeeery close.
run them both together. when the seven minute one runs out, flip IT over...after four more minutes, it's then been a total of eleven minutes.
then you flip the seven one right back over...(yes, it's not full, it has all of four minutes in it.)...and when it runs out, you are done.
7 + 4 + 4 = 15.
run them both together. when the seven minute one runs out, flip IT over...after four more minutes, it's then been a total of eleven minutes.
then you flip the seven one right back over...(yes, it's not full, it has all of four minutes in it.)...and when it runs out, you are done.
7 + 4 + 4 = 15.
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With my wrist watch.
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I think I was right too.....
if you run then both togethor you will have 7 minutes with 4 minutes left on the 11 minute hour glass. Then you flip them both back over...when the 11 minute timer runs out you flip (shich would be exactly 4 minutes) you flip the 7 minute back over...it will have the 4 minutes left in it.
7 + 4 + 4
if you run then both togethor you will have 7 minutes with 4 minutes left on the 11 minute hour glass. Then you flip them both back over...when the 11 minute timer runs out you flip (shich would be exactly 4 minutes) you flip the 7 minute back over...it will have the 4 minutes left in it.
7 + 4 + 4
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um...well...
if you run them both together...the seven runs out, and the eleven has four left, eh?
if you flip the eleven...it has SEVEN in it, since the four would then be on the bottom. so you CAN'T flip the eleven...just the seven. it will then go for four which is when the eleven will run out. at which point, you flip the seven BACK over...and the four that was on the bottom is now on the top...and when it runs out, you have fifteen.
if you run them both together...the seven runs out, and the eleven has four left, eh?
if you flip the eleven...it has SEVEN in it, since the four would then be on the bottom. so you CAN'T flip the eleven...just the seven. it will then go for four which is when the eleven will run out. at which point, you flip the seven BACK over...and the four that was on the bottom is now on the top...and when it runs out, you have fifteen.
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Oh youre right. I was thinking it out right but imagining it wrong.
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when you flip the seven and wait for the eleven to run out there is only three left in the seven...try again
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no dear...there's four.
first flip: both.
at end of seven minutes, there is nothing left in the seven, and four left in the eleven.
second flip: seven.
when the eleven runs out, four minutes have elapsed in the seven.
third flip: seven.
there are three minutes at the top, and four at the bottom, since four have elapsed...you FLIP...then that four is at the top and runs out.
so...seven plus four plus four.
first flip: both.
at end of seven minutes, there is nothing left in the seven, and four left in the eleven.
second flip: seven.
when the eleven runs out, four minutes have elapsed in the seven.
third flip: seven.
there are three minutes at the top, and four at the bottom, since four have elapsed...you FLIP...then that four is at the top and runs out.
so...seven plus four plus four.
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Never mind! Over easy, please...
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Run 11 min glass for 7min using 7 min glass.
Flip 7 min glass and run for 4 min using the remainder of the 11 min glass. 7 min glass will have 4 on one side 3 on the other. Set it on it's side, run 11 min glass and then run the remaining 4 in the 7 min glass.
Flip 7 min glass and run for 4 min using the remainder of the 11 min glass. 7 min glass will have 4 on one side 3 on the other. Set it on it's side, run 11 min glass and then run the remaining 4 in the 7 min glass.
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that works...but with my way, you don't have to wait that first eleven minutes, you can start timing immediately.
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Nice puzzle.
Run both the 7 and 15 minute timers at the same time. When the 7 is finished, start the countdown for the 15 minutes, by letting the remaining 4 minutes on the 11 run down, then flip the 11, to complete the 15 minutes.
Of course, you 'waste' the first seven minutes of the experiment this way, but off-hand I can't think of a way to avoid that.
Oceans
Run both the 7 and 15 minute timers at the same time. When the 7 is finished, start the countdown for the 15 minutes, by letting the remaining 4 minutes on the 11 run down, then flip the 11, to complete the 15 minutes.
Of course, you 'waste' the first seven minutes of the experiment this way, but off-hand I can't think of a way to avoid that.
Oceans
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I don't know....probably why I am always late 
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