2/5 -15 = -14.6
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5 hours subtracted from 7 hours is 2 hours. 5 minutes subtracted from 20 minutes is 15 minutes.Therefore, the answer is 2 hours 15 minutes
If you mean (2/5 times 30) minus (4/3 times 15/8) then the answer is 19/2 or 9.5
9/10 − 2/5 = 1/2
5
-15