Speed Distance time, HELP! Watch

scazmatraz
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#1
Report Thread starter 7 years ago
#1
All morning I have been trying to get my head around S/D/T and its just not happening. have looked at different ways of doing but am really, really struggling. HELP!

Scaz
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py0alb
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In what way? it seems pretty intuitive to me. :confused:
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scazmatraz
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All of it. The simple problems I can manage but then when I have to divide/times long numbers i'm just totally at a lost. None of it is making any sense!
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Ollie901
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Speed is metres PER second.

Thats really all you need to know, you can work out the equation just from that if you forget it. Speed = D/T.
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py0alb
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Can you give us an example of a question you are struggling with?

Surely the concept of "the faster you move, the further you get in a shorter time" isn't especially troubling to a fully functioning adult human being, otherwise how do you ever get anywhere?
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scazmatraz
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At 72 mph, how long does it take to travel 48 miles?

So i know the formula is T = D/S T = 48/72

and then I get stuck... Have to be able to do these types of problems in my head/on paper and the idea of trying to divide 48/72 is baffling! Maybe I am just being stupid, I just haven't done maths in so long
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py0alb
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So it looks like your problem is simply with doing division, rather than anything specific to do with speed.

To do 48/72 its first useful to notice that they're both multiples of 24, so you can simplify it to 2/3 hour which is 40 minutes.

If you don't notice the factor of 24, you should at least be able to recognise that they are both even, and therefore simplify to 24/36... then you still have 2 evens, so reduce to 12/18... then again to 6/9.

If you don't recognise at this point that 6/9 is two thirds then you might be in trouble.
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scazmatraz
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Yeah, lots of problems with long division. need to get practicing! Kinda getting it 50% of the time. Everytime I think i've finally got it, I get royally stuck on the next problem I try
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py0alb
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I can't do long division either, and I have a PhD. I don't know why they bother to teach it, there are far easier ways to work stuff like that out. Just keep factorising, or else have a sensible guess, multiply to test and adjust.
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