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Velocity problem

  1. Jul 12, 2015 #1
    1. The problem statement, all variables and given/known data
    John is on a bike starts his trip at a speed of v=18km/hr and two hours later Derek is on a motorcycle follows at a speed of 72km/hr. How far away from the start point they will meet? How is this problem solved?

    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. Jul 12, 2015 #2
    Express d(t) for each moving object.

    Set them equal.

    Solve for t.

    Compute d(t) at that time.
     
  4. Jul 12, 2015 #3
    V=x/t.So use this formula to reach "How many meter john travel in 2 hours"
    Lets call it ##x_1##.Now the time pass same both of them.
    ##x_1##+VJohntJohn=VDerektDerek
    Use this equation to find solution.
     
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