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Math Help - Kmph to mph question. I didn't know where this should go

  1. #1
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    Kmph to mph question. I didn't know where this should go

    Can a mod please move this to the appropriate subforum?

    Jodie travels at a speed of 80 km per hour for 2 hours 45 minutes. Work out how many miles she drives.

    I understand 5 miles = 8 km but I don't know how to solve the question.
    Sorry for my noobishness, thanks for the help!
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  2. #2
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    Re: Kmph to mph question. I didn't know where this should go

    (80 km/hr)(2.75 hr) (5 mi/8 km)
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    Re: Kmph to mph question. I didn't know where this should go

    ?
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    Re: Kmph to mph question. I didn't know where this should go

    Quote Originally Posted by Ashir View Post
    Can a mod please move this to the appropriate subforum?
    Just a quick comment: Algebra is fine for this topic.

    -Dan
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    Re: Kmph to mph question. I didn't know where this should go

    Okay, thanks.
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    Re: Kmph to mph question. I didn't know where this should go

    Quote Originally Posted by skeeter View Post
    (80 km/hr)(2.75 hr) (5 mi/8 km)
    Let's try it by writing it this way.

    \text{80 km/hr} = \frac{80~km}{1~hr}

    So skeeter's line would read:
    \left ( \frac{80~km}{1~hr} \cdot \frac{2.75~hr}{1} \right ) \cdot \frac{5~mi}{8~km}

    The units cancel out in the same way as numbers do. So in the ( ) is the distance the car travels in km. (The units hr cancel out by division.) This comes from the equation d = vt. Then the last factor converts km into miles. In this case the km cancels out.

    -Dan
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    Re: Kmph to mph question. I didn't know where this should go

    ...I'll just ask my teacher, thanks though
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