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Math Help - quadratic function problem where no equation is given

  1. #1
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    quadratic function problem where no equation is given

    This is the question I am supposed to answer...

    A jet flew from Tokyo to Bangkok, a distance of 4800km. On the return trip, the speed was decreased by 200km/h. If the difference in the times of the flights was 2 hours, what was the jet's speed from Bangkok to Tokyo?

    I have to create an equation that represents this problem and then use it to solve the problem. The only thing I can think of so far is that since speed will decrease by 200km at a time, so I will let x represent the number of 200km increments.

    Other than that I am totally lost so anyone that knows anything would be a big help!! thank you
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  2. #2
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    Quote Originally Posted by melissasim37 View Post
    This is the question I am supposed to answer...

    A jet flew from Tokyo to Bangkok, a distance of 4800km. On the return trip, the speed was decreased by 200km/h. If the difference in the times of the flights was 2 hours, what was the jet's speed from Bangkok to Tokyo?

    I have to create an equation that represents this problem and then use it to solve the problem. The only thing I can think of so far is that since speed will decrease by 200km at a time, so I will let x represent the number of 200km increments.

    Other than that I am totally lost so anyone that knows anything would be a big help!! thank you
    time = distance/speed

    trip over ...

    t = \frac{4800}{v}

    trip back ...

    t+2 = \frac{4800}{v-200}


    solve the system of equations for v ... remember that the question is asking for the value of v-200
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