tag:blogger.com,1999:blog-2893315201359920156.post2353275286321608248..comments2023-10-28T20:35:12.856+05:30Comments on Best Brain Teasers: Hour Glass Puzzlelaveshhttp://www.blogger.com/profile/03731980294342074301noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-2893315201359920156.post-83424892886204990612013-07-21T14:42:09.208+05:302013-07-21T14:42:09.208+05:301. Start both the 7 minute hour glass & 11 min...1. Start both the 7 minute hour glass & 11 minute hour glass.<br />2. Wait till the 7 minute hour glass times out. Time is 7 minute!<br />3. Restart the 7 minute hour glass. At this time 11 minute hour glass will have 4 minutes left to time out.<br />4. As soon as 11 minute glass times out invert the 7 minute hour glass. Total time now is 11 minutes.<br />5. After inverting 7 minute hour glass, it will now have 4 minutes left for time out.<br />6. After these 4 minutes times out, the total time is 15 minutes.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2893315201359920156.post-57260218652622591462012-10-29T16:24:22.456+05:302012-10-29T16:24:22.456+05:30Start with both 11 and 7 glass hors. By the time 1...Start with both 11 and 7 glass hors. By the time 11 glass hour completes one round 7 would have completed one round in a direction and 4 in the other direction. <br /><br />So by the end of 11th minute, in one sand glass we have completed 11minutes and 4 minutes in other.Now reverse the sand glass that completed 4 minutes and it takes 4 minutes to empty out the upper portion<br /><br />As a whole one sand glass counts 11 minutes and the other counts 4 minutes. That sums up to 15 minutes...NAVEEN KUMAR.Pnoreply@blogger.comtag:blogger.com,1999:blog-2893315201359920156.post-45158144641950304262012-10-29T15:55:31.282+05:302012-10-29T15:55:31.282+05:30Start both hourglasses together. When 7 min hourgl...Start both hourglasses together. When 7 min hourglass runs out (and the 11 min hourglass has four minutes left), start counting time from minute 0.<br /><br />Now, 11 min hourglass will run four 4 minutes, then flip it over and let it run for its full duration of 11 minutes. This will measure 4 + 11 = 15 minutes.nksainihttp://www.nksaini.comnoreply@blogger.comtag:blogger.com,1999:blog-2893315201359920156.post-1624232137926116492012-10-29T10:42:37.585+05:302012-10-29T10:42:37.585+05:30seems correctseems correctPuzzle loverhttp://www.gpuzzles.comnoreply@blogger.comtag:blogger.com,1999:blog-2893315201359920156.post-15959635842012287682012-10-29T07:07:41.643+05:302012-10-29T07:07:41.643+05:300:00
Flip both hourglasses
7:00
The 7 min hourgla...0:00<br />Flip both hourglasses<br /><br />7:00<br />The 7 min hourglass runs out. Flip it back over.<br />The 11 min hourglass has 4 minutes remaining. Let it keep running.<br /><br />11:00<br />The 7 min hourglass has 3 mins left. Flip it over, and it has 4 mins.<br />The 11 min hourglass is now empty. Leave it.<br /><br />15:00<br />The 7 min hourglass runs out.oudeishttps://www.blogger.com/profile/02798986999913350014noreply@blogger.com