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?

Result

t =  12 s

Solution:

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

Try another example

Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:

Be the first to comment!

Next similar math problems:

1. Persons
   Persons surveyed:100 with result: Volleyball=15% Baseball=9% Sepak Takraw=8% Pingpong=8% Basketball=60% Find the average how many like Basketball and Volleyball. Please show your solution.
2. Percents
   How many percents is 900 greater than the number 750?
3. 15 teachers
   15 teachers teach for a combined amount of 128 days over a period of 64 days. What is this expressed as a percentage?
4. A trip to the peak Dry
   Calculate what percentage is rising trip from Strečno to peak Suchý (Dry peak) longer than the descent back. Team trio of tourists (Palo, Peter and Andrew) rise took 4:21 and descent 3:08.
5. The ball
   The ball was discounted by 10 percent and then again by 30 percent. How many percent of the original price is now?
6. Profit gain
   If 5% more is gained by selling an article for Rs. 350 than by selling it for Rs. 340, the cost of the article is:
7. Frameworks is bad
   Calculate how many percent will increase the length of an HTML document, if any ASCII character unnecessarily encoded as hexadecimal HTML entity composed of six characters (ampersand, grid #, x, two hex digits and the semicolon). Ie. space as:  
8. Art school
   Every fifth pupil 9A goes to art school. How many percent of pupils in class 9A go to art school?
9. The Chemistry test
   The Chemistry test contained 8 questions, each with 3 points. Peter scored 21 points. How many percent did Peter write a test?
10. Percentages
    52 is what percent of 93?
11. Highway repair
    The highway repair was planned for 15 days. However, it was reduced by 30%. How many days did the repair of the highway last?
12. Summerjob
    The temporary workers planted new trees. Of the total number of 500 seedlings, they managed to plant 426. How many percents did they meet the daily planting limit?
13. Principal and interest
    Peter put € 270 principal into bank and at the end of the year on account was € 282. To what annual interest rate that Peter had deposited money in the bank?
14. Fix + percentages
    Mrs. Vargas is a car sales agent who earns Php.5,850 monthly plus a 4% commision on all her sales. During a month, she sold a car worth Php.740,000. How much is her total earnings?
15. Deposit is pesos
    Sally deposits Php.22,000 in her savings account. If the bank pays 1.5% interest per year, how much will she receive at the end of the year?
16. Mary
    Mary is 12 years old, which is 40% of the age of her mother. How many percent of her mother's age will Mary have after the next 12 years?
17. Monica
    Monica left Php.900 to Bianca. When monica asked for it after 6 months, Bianca decided to give Php.945 instead because she was able to use the money. What interest rate on Monica's money was used by bianca?