Guest Posted January 4, 2012 Report Share Posted January 4, 2012 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted January 4, 2012 Report Share Posted January 4, 2012 turn over both the hourglasses at once.... when the 4 min. hourglass runs out, turn it over... when the 7 min. hourglass runs out, turn it over... when the 4min. hourglass runs out, turn over the 7 min. hourglass. now 8 minutes are over... and only one min. is left in 7 min. hourglass... after the 7 min. hourglass runs out.. 9 minutes are complete Quote Link to comment Share on other sites More sharing options...
0 Peekay Posted January 4, 2012 Report Share Posted January 4, 2012 Start both hourglasses When the 4min runs out, turn it over - 4mins elapsed When the 7min runs out, turn both over - 7mins elapsed (4mins has 1min) When the 1min in the 4min runs out, turn over the 7min - 8mins elapsed (7min has 1min) Let the 1min in the 7min run out - 9mins elapsed Quote Link to comment Share on other sites More sharing options...
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