At a clothing store sale, a shirt costs $15 more than a tie. The total cost of 3
shirts and 3 ties is $99. Which system of
equations can be used to determine the
cost in dollars of a shirt, s, and the cost in
dollars of a tie, t?

What's the denominator

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.