Results 1 to 6 of 6

Math Help - Reasoning Problem

  1. #1
    Member
    Joined
    Sep 2007
    Posts
    198

    Reasoning Problem

    A car started from town A at 7am and reached town B at 9am. Along the same road, a bicycle rider started from town B at 5am and reached town A at 12pm. At what time did they cross each other?

    How can I solve this problem?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Jun 2009
    Posts
    806
    Thanks
    4
    Quote Originally Posted by geton View Post
    A car started from town A at 7am and reached town B at 9am. Along the same road, a bicycle rider started from town B at 5am and reached town A at 12pm. At what time did they cross each other?

    How can I solve this problem?
    Let d km be the distance between the cities.
    The velocity of the car Vc = d/2 km/h
    The velocity of the bicycle Vb = d/7 km/h.
    Find the position of the bicycle when the starts and the distance between the car and the bicycle. Let it be d1. Now start counting the time. If they meet at a point x km from the starting point of the car, they take the same time to reach that point. So
    x/Vc = (d1-x)/Vb.
    Find x in terms of d, then find t.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Mar 2010
    Posts
    2

    help

    In a certain class consisting of 36 students, some boys and some girls, exactly of one-third the boys and exactly one-fourth of the girls walk to school. What is the greatest possible number of students in this class who walk to school? and how?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member
    Joined
    Jun 2009
    Posts
    806
    Thanks
    4
    In the class, let x boys and (36 - x) girls.
    Number of students walking = x/3 + (36-x)/4 ...(1)
    Simplify the equation.
    Select the values of x, which is less than 36, such that number students who walk to the college must be the whole number.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Mar 2010
    Posts
    2
    ..................................
    Last edited by rh1417; March 28th 2010 at 11:50 AM.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor

    Joined
    Apr 2005
    Posts
    14,977
    Thanks
    1121
    The weight of an organ tells you nothing about its oxygen consumption.

    By the way, it is not a good idea to keep appending new questions to the same thread- especially if you were not the one who started the thread.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. help with a reasoning problem.
    Posted in the Geometry Forum
    Replies: 3
    Last Post: February 27th 2011, 05:20 AM
  2. Reasoning and graph problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 20th 2011, 05:05 AM
  3. Reasoning word problem
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: September 22nd 2010, 10:19 PM
  4. Help solving and reasoning a word problem.
    Posted in the Calculus Forum
    Replies: 1
    Last Post: February 3rd 2008, 09:01 PM
  5. Inequality and Reasoning problem
    Posted in the Calculus Forum
    Replies: 6
    Last Post: November 16th 2007, 04:00 PM

Search Tags


/mathhelpforum @mathhelpforum