Ask questions and get helpful responses.
Ask a New Question
  1. Questions

math urgent help!!!

I need serious help with this problem. it is making me pukk my hair out!!!

Yolanda and Yoko ran in a 100-yd dash. When Yolanda crossed the finish line, Yoko was ten yd behind her. The girls then repeated the race, with Yolanda starting 10 yd behing the starting line. If each girl ran at the same rate as before, who won the race? By how many yards?

I said Yoko won by 10 yards. I am pretty sure my answer is wrong. Can someone plz tell me the right answer and how they got it?

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
shivangi

  1. first race:
    Yolanda ran 100 yd in t sec, so her rate is 100/t yds/sec
    Yoko ran only 90 yds in t sec, so her rate is 90/t yds/sec

    second race:
    Yolanda ran 110 yds at 100/t yds/sec for a time of 110/(100/t) or 1.1t seconds
    yoko ran 100 yds at 90/t yds/sec for a time of 100/(90/t) or 1.11111...t sec

    since 1.1 t < 1.111t, Yolanda won again

    the difference in their times is
    │(11/10)t - (10/9)t │ = (1/90)t

    which at Yoko's rate gives a distance of
    90/t * (1/90)t = 1 yard

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Reiny

  2. thnx 4 hlping!!!!! but one more question, i didn't understand the last part of the explanation. how many yrds did yolanda win by?

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    shivangi

  4. 1 yard

    remember distance = rate*time

    Yoko ran (1/90)t seconds longer at her rate of (90/t) yards/sec

    so distance = 90/t * (1/90)t
    = (90t)/90t) = 1

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Reiny

  5. Yolanda= 100/time
    Yoko=90/time
    So yolanda Wins yoko by 1yard

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Yoselin

Respond to this Question

First Name

Your Response

Similar Questions

  1. Probability

    For hair color, Brown (B) is a dominant trait and Blond (b) is a recessive trait. If one parent has pure blond hair and one parent has hybrid brown hair, complete the Punnett square and questions that follow. a) What is the

  2. math

    you decide to dye your hair in various colors. If you die 1/3 of it blue , 1/4 pink and 1/4 of it black how much of your original hair is left?

  3. Mathematics

    Identify the level of measurement of the data, and explain what is wrong with the given calculation. In a survey, the hair colors of respondents are identified as 10 for brown hair, 20 for blond hair, 30 for black hair, and 40 for

  4. Bio

    Blonde hair (bb) is a recessive trait and brown hair (Bb) is dominant. If both parents have brown hair, what must be true if one of their children have blonde hair? A. Both parents must be hybrid with regard to hair color (Bb) B.

  1. Physical Science

    The current in a hair dryer measures 15.0 amps. The resistance of the hair dryer is 8 ohms. What is the voltage? A. 120 V B. 0.5 V C. 7 V D. 1800 V I tried this and got D but it was wrong....can I get a little help on how to do

  2. English expression

    1. He is of medium height. 2. He is of average weight. 3. He has medium height. 4. He has average weight. 5. He has long curved hair. 6. She has short straight blond hair. 7. She has medium-length wavy blonde hair

  3. PHysics

    A glass rod rubbed against your hair gains a charge of -14.0 nC. What is the electric force between the balloon and your hair when the two are separated by a distance of 7.1 cm? (Assume that the charges are located at a point.)

  4. Science

    In humans the allele for curly hair and the allele for straight hair show incomplete dominance. If two people with wavy hair have offspring, what percentage of their offspring would you expect to have wavy hair? A.) 100% B.) 75%

  1. Math

    James counts the hair colors of the 22 people in his class including himself. He finds that there are 4 people with blonde hair, 8 people with brown hair, and 10 people with black hair. What is the probability that a randomly

  2. Math

    Consider the two savings plans below. Compare the balances in each plan after 7 years. Which person deposited more money in the​ plan? Which of the two investment strategies is​ better? Yolanda deposits ​$550 per month in an

  3. Science

    When hair is combed with a hard rubber comb, the hair becomes positively charged because the comb A. Transfers protons to the hair B. Remove electrons from the hair C. Transfers electrons to the hair D. Remove both times from the

  4. English

    1. To come up with possible solutions to a problem is referred to as: A. decision making. B. concept mapping. C. critical thinking. D. problem solving. is it D 2. "Should I apply for a job or go for an internship?" is an example

Still need help? You can ask a new question.