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See Answer

ANSWER: It will take the fly 2 minutes and 14 seconds.

EXPLANATION: The shortest path is shown below:


The fly crosses at the midpoint of the edge. Each half of the path is the hypotenuse of a right triangle where the other sides take the fly 60 seconds and 30 seconds respectively to travel. Let h represent the number of seconds it takes the fly to travel one hypotenuse:
h² = 60² + 30²
h = √4500 = 67.1s
So the time to travel both diagonals is 134.2s.

Another way to approach the puzzle is to imagine the two faces/sides of the cube unfolded/flattened as shown below:



So, in minutes:
AC² = AD² + CD²
AC² = 2² + 1²
AC = √5
AC = 2.236 minutes = 134.2s

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