Question

a long distance trucker traveled 72 miles in one direction during a snow storm. The return trip was accomplished in the rain at double speed in 2 hours less time. Find the speed going

Answer 1

d = r*t

72 = rt
72 = (2r)(t-2)
set the equations equal
rt = 2rt - 4r
rt = 4r
t =4
substitute 4 for t
72 = 4r
18 = r