615 is a time of day: it is not, and cannot be expressed, as a fraction of an hour.
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It depends on 40 minutes as a fraction of what - an hour, day, week, etc.
0 hours
-- One hour = 60 minutes. -- A fraction of an hour is the same fraction of 60 minutes. -- To convert a fraction of an hour to minutes, multiply the fraction by 60 minutes.
A decimal is a representation of a number and is independent of the units used. Unless, you are asked to write a nanosecond as a decimal fraction of a second or an hour or whatever.
Restate the question: If you can write a fraction as a decimal, can you write a decimal as a fraction?Yes.