Algebra (worksheet due tomorrow)

I cannot figure out what the answer to this problem is. Can somebody help plz? any help is greatly appreciated!

Tony swims 100 m downstream in 175 seconds. It takes him 400 seconds to swim back upstream.

5. Find Tony's rate with the current. I got r+c=175, where r=Tony's rate and c=rate of current.

6. Find Tony's rate against the current. I got r-c=400.

7. Find Tony's rate with no current.

8. Find the rate of the current.

9. What are the total distance and total time?

10. Find Tony's average speed.

Ok, I tried the addition method thing where you add r+c=175 to r-c=400 and you get 2r=575 which equals r=287.5, but it isn't possible. Can somebody help? I might be able to figure out problems 8.-10., but I don't get problem 7. Oh, and one more question...what would be the units for his average speed? Would it be meters/seconds?

Thank you very very very much!

try doing what tonyt did and count the time it takes

uh... what do you mean by that?

make a chart and it becomes very easy

-------------Dist------Rate-----Time

upstream---400(r+c)m---r+c m/s---400 sec
downstream-175(r-c)m---r-c m/s---175 sec

but we know the distance is 100 m, so...

400(r+c)=100
175(r-c)=100

r+c=1/4 I divided by 100
r-c= 4/7 I divided by 175

add these two
2r=23/28
r=23/56 m/s or .411 m/s

sub back to get c=.161 m/s

  1. 👍 0
  2. 👎 0
  3. 👁 197

Respond to this Question

First Name

Your Response

Similar Questions

  1. SS HELP PLZ ASAP

    1) The science that studies population distribution and change is called _________(1 point) A. demography B. geography C. economy D. sociology 2) Canada is bigger than the united states, but only has _______ as many people.(1

    asked by regan on November 2, 2015
  2. Math help plz

    Dresser is 3 3/4 feet from 8 foot ceiling .what height of dresser in feet . Plz answer the question , I try to do my mind is hurting could not figure out. My answer is 4. 75 ...I don't know if I m wrong or right.

    asked by Anonymous on November 24, 2011
  3. calculus help me plz too hard show step

    charge Q coulombs at time t seconds is given by the differential equation RdQ/dt+Q/C=0, where c is the capacitance in farafd and R the resistance in ohms.solve the equation for Q given that Q=Qo where t=0 plz show step plz plz plz

    asked by ... on December 27, 2016
  4. Geometry

    In the △PQR, PQ = 39 in, PR = 17 in, and the altitude PN = 15 in. Find QR. can u guys show how to solve the problem(plz include answer) i got 42 by using the pythagorean theorem i am not sure if i am correct but can u check it

    asked by Allie on February 17, 2017
  5. LIVING ENVIRONMENT

    the ability to grow in size is a characteristic of living organism .Although an icicle may grow in size over time,it is considered nonliving because there is 1)an incerase in matter ,but no increase in the number of icicle. 2)an

    asked by tania sharmin on February 12, 2013
  1. biology

    a boy inherits genes for tallness,but his growth is limited as a result of poor nitrition. this is an example of 1)an inherited disorder. 2)environmental influence on gene expression . 3)expression of a hidden trait 4)a

    asked by tania sharmin on February 8, 2013
  2. math

    Tim wants his mean (average) quiz score in history class to be 90. His first 3 quiz scores were 86, 92, and 94. What score should he make on the 4th quiz in order to have a mean (average) quiz score of exactly 90? I really need

    asked by felicia on June 2, 2012
  3. chemistry

    This question I really don't get it. I tried tried tried to figure out how to start solve the problem but still couldn't figure out. So can you help me with one question PLEASE? If so, can you please explain to me how you get the

    asked by Laura on June 14, 2012
  4. Math

    I cannot remember how to figure out this problem. "Ten friends share 3 pizzas equally. What fraction of a whole pizza does each friend get?" Would it be 3/10? Not looking for the actual answer but really how i can figure it out.

    asked by Renee on March 20, 2011
  5. Chemistry chlorine plz help

    A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need

    asked by Daniel on January 12, 2016
  6. Quadratic Functions2

    Determine the standard form of a quadratic function whose graph has a y intercept of 8 and a vertex at (-2,-4). The answer is f(x)= 3x^2 + 12x +8 but I can't figure out how to get the answer. Solve x^2 + x=6, by factoring. The

    asked by Heaven on June 1, 2016

You can view more similar questions or ask a new question.