# Helmet

In nowadays cycling better results could be obtained not only due to rider physical preparation but also thanks to using updated technologies. One of the most important part of rider´s equipment is his or her helmet.
While most bikers wear a helmet mainly to protect themselves, racers use modern technologies which can improve certain features like aerodynamics and in this way enable them to reach a better time in a race. It´s quite important especially during the special parts of the race called time trial.

Providing the helmet thanks to its advanced shape can increase racer´s performance of a half percent. HOW MUCH can the racer shorten his time in a 40-minute time trial?

Result

t =  12 s

#### Solution:

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