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:

$p=\dfrac{ 0.5 }{ 100 }=\dfrac{ 1 }{ 200 }=0.005 \ \\ \ \\ t_{1}=40 \ min \rightarrow s=40 \cdot \ 60 \ s=2400 \ s \ \\ \ \\ t=p \cdot \ t_{1}=0.005 \cdot \ 2400=12 \ \text{s}$

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