Results 1 to 3 of 3

Math Help - Another word problem

  1. #1
    Junior Member
    Joined
    Apr 2006
    Posts
    29

    Another word problem

    A river flows at 2km/h, and John takes 6h to row 16km up the river and 16 km back, how fast did he row?

    I need to know how to answer a word problem like this on a test tomorrow... can someone explain to me how to solve it? also, any possible tips on solving word problems would be great, thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by sugar_babee
    A river flows at 2km/h, and John takes 6h to row 16km up the river and 16 km back, how fast did he row?

    I need to know how to answer a word problem like this on a test tomorrow... can someone explain to me how to solve it? also, any possible tips on solving word problems would be great, thanks
    Let Johns speed with respect to the water be vkm/h, then when
    rowing with the flow he is travelling at (v+2)km/h, and against the flow
    (v-2)km/h.

    He rows 16km with the flow and 16km against the flow.
    These take 16/(v+2)h, and 16/(v-2)h respectively
    and their total is 6h.

    So we have:

    <br />
\frac{16}{v+2}+\frac{16}{v-2}=6\ \ \ \dots (1)<br />
.

    Now we have translated the word problem into a mathematical problem, it
    remains to solve (1), and check which of the answers make
    sense for this problem

    RonL
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Apr 2006
    Posts
    29
    Thanks a lot, thats great
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. word problem - the snow plough problem?
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: October 13th 2011, 01:02 PM
  2. Replies: 3
    Last Post: January 2nd 2011, 08:20 PM
  3. 1 Word problem and 1 function problem
    Posted in the Algebra Forum
    Replies: 8
    Last Post: April 21st 2010, 08:01 AM
  4. Replies: 2
    Last Post: January 10th 2009, 05:49 AM

Search Tags


/mathhelpforum @mathhelpforum