mysteryman on 20 February 2015
| RolStoppable said: I say nine minutes because the question asks solely for the preparation time of the egg itself. |
Preparation time of the egg includes setting up the hourglasses as required beforehand.
palou said:
I try again: start the 7 and the 4 at the same time, When 4 is finished, turn around both, put egg in, when 7 is finished, turn over both, when 4 is finished turn over 7, when 7 is finished, take out egg. 13 minutes. |
13 minutes is also incorrect.
