As given in the picture, the formula for a cube's surface area is

, which s is the length of one side of the cube. So let's solve:
40 as the numerator and 64 as the denominator which can be simplified to 5 over 8
5^5=5*5*5*5*5=25*25*5=625*5=3125
It would happen again at 1 hour and 5 minutes .
That is because at noon it is 12 p.m. and for the minute and the hour hands overlap, the next time it would happen is at 1:05 which is going to overlap again