Volume is an unreliable measurement because              a.  there's no standard size of measuring cup or spoon.      b.  solids can't be measured accurately by volume.      c.  food expands or contracts in different temperatures.      d.  gas weighs less than liquid.

D cause gas is an air unless you mean car gas then anyways its D

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.