There are two possible answers:
2/5 problems per minute
or
5/2 minutes per problem.
The logic behind these fractions is simple. You have two measures: 2 problems and 5 minutes.
So one fraction, the first, is "2 problems" divided by "5 minutes"
and the other is "5 minutes" divided by "2 problems".
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It is a mixed fraction.
The denominator in the unsimplified fraction.
A fraction.
1/4
1.75 as a fraction in its lowest terms = 7/4