Short answer: 3/4
How to solve:
So the total time is 40 minutes. So it is the denominator of the fraction (goes on the bottom). The other part, 30 minutes, is the numerator and goes on top. So we've got 30/40. This simplifies if we divide both the top and the bottom by 10. Then, the simplified form is just 3/4. If you want this as a percent, it's 75%.
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You have to divide it by something. As a fraction of an hour, 40 minutes is 40 / 60 = 2/3 hour.
30 minutes = 1/2 hour
40% equal to fraction 30 what is value of X?
It depends of "as a fraction" of what? A day, a year, a century, a second - each of these will give a different answer.
2/3 h