bonanova Posted November 13, 2014 Report Share Posted November 13, 2014 What is the most efficient way to time a 15-second interval using a 7-second and an 11-second hourglass? Quote Link to comment Share on other sites More sharing options...
0 karthickgururaj Posted November 13, 2014 Report Share Posted November 13, 2014 What is the most efficient way to time a 15-second interval using a 7-second and an 11-second hourglass? Start both together. As soon as 7-sec hour-glass ends, 15-sec interval starts. When 11-sec hour-glass ends, flip it over. When it ends again, 15 secs are over. Quote Link to comment Share on other sites More sharing options...
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bonanova
What is the most efficient way to time a 15-second interval using a 7-second and an 11-second hourglass?
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