Maintaining speed during last 30 meters

Whats the best way to go about doing this?and what does an 11.62 100 translate into a 55m?

improving top speed and improving speed endurance.

Depending on the athlete’s power/strength qualities and maturation of block clearance/acceleration, 6.8x-6.9x may be about right. Check the Mercier Scoring Tables and convert to 55m.