lond distance trucker traveled 156 miles in one directionduring a storm. Thereturn trip in rainy weather was accomplished at double the speed and took 3hrs less time. Find the speed going.
Doubling the speed means he got to the destination in half the time. So half the time is 3 hours. The original trip took 6 hours, so the speed was :
156/6 m.p.h.