Minimum Maximum Minimum
-pi/5 (-pi/5)+(pi/30) (-pi/5)+(4pi/15) 4pi/15
Shifted pi/12 to the left
for f(x)=sin x halfway between the minimum and the maximum would be 0pi. But for the information the problem gives us, halfway between the minimum and the maximum is -pi/12.
So this one has been shifted pi/12 to the left.
Let me know if you need further help with this one. :-)