Thank goodness, Willa has arrived, better late than never!
Bathsheba and Wila, spot on. ? for you.
Doodle ? for your poem.
Callistemon ?for initiative.
For my other favourite pupils. Pantglas, Gillybob and Feelingmyage, ? for being such good sports.
Here was the solution, I was going to post, before the others beat me too it.
ANSWER: Drop the egg in the boiling water and flip both hourglasses over. When the 4-minute hourglass runs out, flip it over. When the 7-minute hourglass runs out, flip it over as well. Now there is one minute left in the 4-minute hourglass. When it runs out, 8 minutes will have elapsed and there will be 6 minutes left in the 7-minute hourglass. Flip over the 7-minute hourglass again. A minute later the 7-minute hourglass will run out and a total of 9 minutes will have elapsed.
PS:, I'm not sharing my chocolate stash, Doodle.