You have to divide it by something.
As a fraction of an hour, 40 minutes is 40 / 60 = 2/3 hour.
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108 minutes = 108/1 minutes (in fraction form).
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
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
40 cm/2 m = 40cm/200 cm = 40/200 = 1/5 or 0.2