A long distance trucker traveled 160 miles in one direction during a snow storm. The return trip in rainy weather was accomplished at double the speed and took 4 hours less time. find the speed going.

Question

A long distance trucker traveled 160 miles in one direction during a snow storm.  The return trip in rainy weather was accomplished at double the speed and took 4 hours less time.  find the speed going.

anonymous · Answer

R=rate T=time
R*T=160
2R(T-4)=160

set equal to each other and solve for S, then plug S into one of the equations and solve for T