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-   -   Kinematics two bikers leaving at same time where do they meet and when (https://www.askmehelpdesk.com/showthread.php?t=448778)

  • Feb 18, 2010, 04:14 PM
    seanspan
    Kinematics two bikers leaving at same time where do they meet and when
    Two towns are 20km apart. A biker leaves from the first town at 20km/h and another biker leaves the second town at the same time travelling 15km/h. Where and when will they meet?

    Im confused on how to set up and solve this question some help would be appreciated
  • Feb 19, 2010, 04:20 AM
    Unknown008

    Use your formulae.

    Since they travel at constant speed, you can use:



    Since they meet at a fixed distance from town A and town B (I'll call them as such), the distance is not known. Let's call it 'x' being the distance from town A.
    From A, the biker will travel x km
    From B, the biker will travel (20-x) km.

    This gives

    20 = x/t
    15 = (20-x)/t

    Solve the simultaneous equation, the value for x gives you the distance from town A, and the time is the time passed between their departure and their meeting.

    I hope it helped! :) Post your answer if you're not sure.

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