You need to find the least common multiple of their denominators.
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They must have the same denominators.
you can't add nor subtract mixed fractions so you need to turn it into a fraction, if you wanna turn a mixed fraction into a fraction you need to multiply the whole number by the denominator, then add the numerator, then you can multiply normally (make sure you simplify and turn it into a mixed fraction your answer)
It is 15/60, which can be simplified, but probably best to see if you need to add or subtract other fractions of an hour before simplifying.
To add a negative fraction to a mixed fraction, first convert the mixed fraction to an improper fraction. Then, find a common denominator for both fractions. Next, add the numerators and keep the common denominator. Finally, simplify the resulting fraction if needed. If the negative fraction has a smaller absolute value than the mixed fraction, you may need to borrow or regroup to ensure proper subtraction.
You need common denominators. Then add or subtract the numerators. If the answer is an improper fraction it is common practice to reduce it to a mixed number.