Select the relations that are functions.
{a, 1), (6, 1), (c, 1);
{a, , , c)}
{(1, a), (2, , a)}
{a, a), (b, b), (c, c)}

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.