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:

$$\begin{gathered} p={\displaystyle \frac{0.5}{100}}={\displaystyle \frac{1}{200}}=0.005 \\ {t}_1=40\text{ min}\to \text{ s}=40\cdot 60\text{ s}=2400\text{ s } \\ t=p\cdot t_1=0.005\cdot 2400=12\text{ s} \end{gathered}$$

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