The last one is the answer.
If the number is no less than 6, that means that it is not any smaller than 6.
That narrows the answer down to x > 6 and x >= 6. The difference between these two choices is that x>6 means that x cannot equal 6, while the last choice is greater than OR equal to 6.
Since we are looking for when the minimum value for x is 6, x >= 6 is the answer.
There are 3 numbers, first let list all the factors of 12, 1,2,3,4,6,12 and now which are multiple of 3, 3, 6,12 therefore we are left with 1,2,4!
If you wanted the time progressed, it's 7 hours and 30 minutes