Answer :
(a/b)/(c/d)=(a/b)(d/c)=(ad)/(bc)
invert and multiply
(5/1)/(1/8)=(5/1)(8/1)=(5*8)/(1*1)=40/1=40
invert and multiply
(5/1)/(1/8)=(5/1)(8/1)=(5*8)/(1*1)=40/1=40