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Math Help - Hours and driving time help?

  1. #1
    Newbie Waveform's Avatar
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    Question Hours and driving time help?

    Hi,
    I donít know why my brain is not working for this general math problem. How would I figure the driving time in this problem?

    Say it takes me 1 hour to get from point A to B traveling at 65MPH
    How long would it take me to get from point A to B if I was only traveling 55MPH?
    Iím looking for the time difference but Iím not sure what I need to divide, or how to break it down and visualize the problem?

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    Mike
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Waveform View Post
    Hi,
    I don’t know why my brain is not working for this general math problem. How would I figure the driving time in this problem?

    Say it takes me 1 hour to get from point A to B traveling at 65MPH
    How long would it take me to get from point A to B if I was only traveling 55MPH?
    I’m looking for the time difference but I’m not sure what I need to divide, or how to break it down and visualize the problem?

    Advanced Thanks
    Mike
    If it took you 1 hour to go from A to B at 65 MPH, it means the distance between A and B is 65 miles.

    Now speed = distance/time
    => time = distance/speed
    = 65/55 = 1.18 hours
    = 1 hr 11 mins approximately is needed to go from A to B travelling at 55 mph
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  3. #3
    Newbie Waveform's Avatar
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    Question

    Hi, Thanks
    1 hour equaling 65, I should have seen that plain as day, I can’t believe it.

    I see what you mean about the deviding part but how did you get the 11 mins approximately? You came out with 1.18, are you just rounding that? I’m not sure what you’re doing there?

    Edit, never mind that last question.
    I got it, (1.18), your not counting the number 8 because that would be in the seconds.
    I got it, Thank you for the help. I don't understand why I’m able to do all basic math as well as fractions and some algebra yet when you start putting real world example on the board I got mixed up.
    Last edited by Waveform; February 26th 2007 at 08:44 PM.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Waveform View Post
    Hi, Thanks
    1 hour equaling 65, I should have seen that plain as day, I can’t believe it.

    I see what you mean about the deviding part but how did you get the 11 mins approximately? You came out with 1.18, are you just rounding that? I’m not sure what you’re doing there?

    Edit, never mind that last question.
    I got it, (1.18), your not counting the number 8 because that would be in the seconds.
    I got it, Thank you for the help. I don't understand why I’m able to do all basic math as well as fractions and some algebra yet when you start putting real world example on the board I got mixed up.

    Not exactly. the answer was 1.18 hours, which means 1 hour + 0.18 hours. 0.18 of an hour is 10.8 minutes. How did i get that? well, one hour is 60 minutes, 0.18*60 mins is 10.8 minutes, so the total was 1 hr 11 minutes. If i wanted the seconds, i would find 0.8 of a minute by 0.8*60 = 48 seconds.

    So the 1.18 was not a division in the form hr.min but rather the fraction of an hour i had.

    If you dont see it clearly, think of it this way. 0.18 is about 0.20 which is 1/5. so what i had was roughly 1 1/5 hours. 1/5th of an hour is 12 minutes. Since i had a little less than one fifth, the minutes part was a little less than 12 minutes
    Last edited by Jhevon; February 26th 2007 at 09:14 PM.
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  5. #5
    Newbie Waveform's Avatar
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    Question

    I see now, Thanks Jhevon
    I don’t understand why other people are so good at visualizing this stuff. It’s probably because I only had one math class in high school and maybe just need to go back to a general math book. I thought myself fractions and started some algebra but I never really knew how to assess myself till all these real world problems starting popping up. This stuff should be common sense; I can’t believe I didn’t know this

    Do you have any tips for becoming more visual with general math problems? I mean, what makes this stuff clear in ones head?

    Thanks for the help above!
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Waveform View Post
    I see now, Thanks Jhevon
    I don’t understand why other people are so good at visualizing this stuff. It’s probably because I only had one math class in high school and maybe just need to go back to a general math book. I thought myself fractions and started some algebra but I never really knew how to assess myself till all these real world problems starting popping up. This stuff should be common sense; I can’t believe I didn’t know this

    Do you have any tips for becoming more visual with general math problems? I mean, what makes this stuff clear in ones head?

    Thanks for the help above!
    I dont really know what to tell you Waveform, i feel exactly the way you do when it comes to the math i'm doing."how the hell do these guys visualize this stuff?!" One thing is for certain though, experience is invaluable. It's just like when you watch your favorite movie over and over, eventually you start seeing things that you've never noticed before, like something funny happening in the background. it's the same with math. the more problems you do, the more experience you gain, the better you become at noticing the subtletes of math and how the concepts work together.

    You have taught yourself some math topics, i find that impressive, just continue to do things like that and you will be fine.

    Another tip is learning math jargon. words like per, of, sum, difference, etc, they all mean something, learn to notice such words and assess their relevance. For instance, when i saw this problem, my thought process went something like this.

    Hmm, how long would that take? I know it will take longer since we're moving slower, but just how much longer? ok, i know i travelled at 65 miles per hour last time. Per means divide, so it was 65 miles/hour, 65 miles in 1 hour, that must mean the two points were 65 miles apart. so now i know the distance, how do i relate the distance between the points to my new speed? Oh yeah, speed is distance per unit time (which is why they said at a speed of 65 miles/hour). Okay, so speed is distance/time, i know the distance and the speed, so now i just solve for time.
    Last edited by Jhevon; February 27th 2007 at 07:56 PM.
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  7. #7
    Newbie Waveform's Avatar
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    Thumbs up

    Good explanation Jhevon,
    Thanks for taking the time to type all this out, I truly appreciate it and learned from it.
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  8. #8
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Waveform View Post
    Good explanation Jhevon,
    Thanks for taking the time to type all this out, I truly appreciate it and learned from it.
    You're welcome. Good luck in your academic pursuits
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