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    serenitymantra's Avatar
    serenitymantra Posts: 28, Reputation: 1
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    #1

    Jun 18, 2009, 04:22 PM
    Car traveling 140km/hr being chased by trooper @ 150km/hr
    A car traveling at 140km/hr is being chased by a trooper @ 150km/hr. If the trooper starts 2 km back, how long will it take the trooper to intercept the motorist?


    I am having trouble setting up the problem... help.. Thanks!
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Jun 18, 2009, 04:28 PM

    Speed is relative, just subtract 140km/hour from each speed, that should make the answer obvious.
    serenitymantra's Avatar
    serenitymantra Posts: 28, Reputation: 1
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    #3

    Jun 20, 2009, 08:43 AM
    Quote Originally Posted by Capuchin View Post
    speed is relative, just subtract 140km/hour from each speed, that should make the answer obvious.
    I don't have to take the 2km back into account?
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #4

    Jun 20, 2009, 10:45 AM

    It's as if the speeder's car is standing still and the trooper's car is traveling at the difference in speed. The 2km is how far the trooper has to travel.
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