# Helmet

Nowadays cycling better results could be obtained not only due to rider physical preparation but also thanks to using updated technologies. One of the essential parts of the 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 essential, especially during the particular parts of the race called time trial.

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

Correct result:

t =  12 s

#### Solution:

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