The solution is : the least common denominator of 3/10 and 4/5 is 20.
The least common denominator is the smallest number of all the common multiples of the denominators when 2 or more fractions are given.
here, we have,
Let's list some multiples of each denominator
5: 5, 10, 15, 20, 25, 30
and,
10: 10, 20, 30, 40, 50, 60
and,
4: 4, 8, 12, 16, 20, 24, 28
so, we get,
The common denominator (LCD) is 20
So lets input
6/20, 20/20
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27.5 hours because the amount divided by three gets you that