Question 535122
as you surmise, there is missing information


you have the speed and distance for the "catch up" so you can find the time


but if you don't know the speeder's "head start", you can't calculate his speed


even if "immediate" means no time for the U-turn; the p.p. goes from zero to 140 mph in zero time?


the only "definite" is that the speeder is going less than 140 mph