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.

Answer 1

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.