During a recent Formula 1 race meeting, Blake managed to complete a lap with an average speed of 150 mph.
They managed to complete the first two fifths of the lap length at a speed of 123 mph and the second two fifths of the lap length at a speed of 164 mph.
At what speed was the final one fifth of the lap length covered?
Puzzle Copyright © Kevin Stone
Answer: www.brainbashers.com/puzzle/ztxp