Results 1 to 2 of 2

Math Help - Dad can't solve

  1. #1
    Ibdaddyp
    Guest

    Dad can't solve

    The word problem (designated as algebra) reads:

    In his fishing boat, Nathan went downstream moving at one hour less than he went upstream the same distance. If the current is moving at 4 miles per hour, how fast can he travel on still water, if it took him three hours to make the upstream trip.

    I double checked the wording of the problem.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Site Founder MathMan's Avatar
    Joined
    Mar 2005
    Posts
    63
    Thanks
    2
    Ok I think this is how you solve it:

     x = speed he can row
     c = speed of current
     T_u = Time to travel Upstream
     T_d = Time to travel Downstream
     D = Distance traveled

     Distance = Speed * Time

     Speed = x \pm c

    Since the Distance is the same in both directions we have:

     T_u(x-c) = D = T_d(x+c)

    T_u = 3
    T_d = 2

    3(x-4) = 2(x+4)
    3x-12=2x+8
    x=20

    So his speed is 20 miles per hour
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. need to solve summation equation to solve sum(x2)
    Posted in the Statistics Forum
    Replies: 2
    Last Post: July 16th 2010, 10:29 PM
  2. how do i solve this IVP: y'=y^2 -4
    Posted in the Differential Equations Forum
    Replies: 2
    Last Post: February 24th 2010, 11:14 AM
  3. Replies: 1
    Last Post: June 9th 2009, 10:37 PM
  4. how do i solve this?
    Posted in the Algebra Forum
    Replies: 2
    Last Post: August 2nd 2008, 02:58 PM
  5. how to solve ..
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: August 2nd 2008, 08:17 AM

Search Tags


/mathhelpforum @mathhelpforum