2/3
How to find this? Multiply 40 minutes by (1 hour / 60 minutes), which has a value of 1.
40 minutes * (1 hour / 60 minutes) = 40/60 hours = 2/3 hours
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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.
2/3 h
It depends of "as a fraction" of what? A day, a year, a century, a second - each of these will give a different answer.
Fraction of one hour is 45 minutes is 0.750
Fifteen minutes as a quarter of an hour.