In this problem, a, b, c and d are nonzero integers. if a/b is added to x, the sum is c/d. which statement can be used to prove that x must be a rational number? x = c-a/d-b, x= c+a/d-b, x=cb+ad/bd, x= cb-ad/bd

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.