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Math Help - Related Rates Problem

  1. #1
    Junior Member
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    Sep 2008
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    (Solved)Related Rates Problem

    Hello,

    I need help with the following question. I couldn't find a equation for the distance between the trains. How do i deal with train A is 70km north of train B? and trains traveling in different direction.

    At 8 am, train A is 70km north of train B. Train A traveling west at 50km/h and train B traveling east at 60km/h. How fast is the distance between the trains changing at 12 pm.

    I have my diagram here
    Related Rates Problem-di.jpg
    known rates
    da/dt = 50km/h
    db/dt = 60km/h
    unknown rates
    dc/dt t=4

    Help and Thanks

    I solved myself, I just noticed i can form a triangle with a+b .
    Last edited by hovermet; October 18th 2011 at 08:34 PM. Reason: Solved
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