Given a = {a, e, i, o, u} and b = {a, l, g, e, b, r}, find a ∪ b.

{}
{a, e}
{a, b, e, g, i, l, o, r, u}

indicates you want the UNION of sets A and B.  So just make a list of elements that are in either set ("put all the elements into one 'box'").  Elements are listed only once; example:  a is in both sets, so put it in the union only once.

the 3rd choice, {a, b, e, g, i, l, o, r, u}

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.