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30/60-20/60+15/60-12/60 = 13/60
b) 1/2+1/3+1/4-(1/5)=
1/2+1/3+1/4-1/5=
30/60-20/60+15/60-12/60=13/60
c) -1/2+(-1/3)-(-1/4)+1/5=
-1/2-1/3+1/4+1/5=
-30/60-20/60+15/60+12/60=-23/60
d) (-4/7)*(-14/3)*(-1/5)=-8/15