document.write( "Question 1120823: Can you measure a time interval of 7 minutes using two sandglasses of 5 and 8 min each? If so, how? \n" ); document.write( "

Algebra.Com's Answer #736504 by ikleyn(53765) $\"\"$ $\"About$

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document.write( "Setup both sandglasses to the normal start position and let them start simultaneously.\r\n" );
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document.write( "After 5 minutes (measured with 5-minute sandglass) 5-minute sandglass is empty; 8-minute sandglass has 3 minutes remained.\r\n" );
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document.write( "At this moment, turn over 5-minute sandglass; 8-minute sandglass still continue to measure their remaining 3 minutes.\r\n" );
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document.write( "When 8-minute sandglass will empty, 5-minute sandglass still has 2 minutes remaining.\r\n" );
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document.write( "Starting from this moment, you start measure/watch your 7-minute time interval.\r\n" );
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document.write( "You wait these remaining 2 minutes at 5-minute sandglass and then turn it over to wait (to give it) 5 additional minutes.\r\n" );
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document.write( "2 + 5 = 7 minutes is that 7-minute interval you were requested to measure.\r\n" );
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