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Very challenging Higher Maths Question - apparently

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Very challenging Higher Maths Question - apparently

http://www.bbc.co.uk/news/uk-scotland-34476699
Except from my 'A' Level Maths it is obvious how to do it
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Community Veteran
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Re: Very challenging Higher Maths Question - apparently

a(i) and a(ii) are trivially easy and not really A-level. However b needs a bit of calculus which I've forgotten the relevant bits of in the (very many) decades since A-levels.  Cheesy
Doesn't look very difficult though and if all else fails draw a graph!
If you're bored work out the width of the river and the speeds on land and in the water, not that you need to to solve it.
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Re: Very challenging Higher Maths Question - apparently

42...
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Re: Very challenging Higher Maths Question - apparently

a
  i) Not long, the crocodile is hungry
  ii) Not long, the crododile is hungry
b)
  x = a lot shorter than the rest of the 20 meters in the diagram
  T is a lot shorter  Cheesy
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Re: Very challenging Higher Maths Question - apparently

Quote from: twocvbloke
42...

lol - not a bad answer
divide 42 by 4.2424242  would be closer
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Re: Very challenging Higher Maths Question - apparently

Well, 42 is the meaning of everything... Cool
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Re: Very challenging Higher Maths Question - apparently

Not even close. x=8 and 9.8 seconds is the fastest.
(And I used commonsense/ratios rather than calculus)
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Re: Very challenging Higher Maths Question - apparently

Quote from: HPsauce
98 seconds

I was a factor of 10 out, I made it 9.8 seconds
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Re: Very challenging Higher Maths Question - apparently

You're correct. The question is stated in units of tenths of a second, I missed out the decimal point.  Wink
But rethinking it as a geometric problem gets the answer quite quickly.
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Re: Very challenging Higher Maths Question - apparently

Manipulating formula is not higher maths  Tongue
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Re: Very challenging Higher Maths Question - apparently

I agree, in my day you would have had to work out the formula/equation for starters, not be given it!  Cry
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Re: Very challenging Higher Maths Question - apparently

Of course, in every day life in britain, nobody needs to work out how fast a croc would be travelling on it's way to a zedbra... Grin
nanotm
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Re: Very challenging Higher Maths Question - apparently

no but the same thinking can be used to work out the quickest way to catch a fleeing criminal, of course most of use would do such calculations on the subconscious level and just arrive at the destination, some people use it to gauge the time required to get to work on any given day with certain traffic conditions allowing for various weather conditions etc
the only people I know of that actually sit down and figure it out as some kind of equation on paper are geeks, the conundrum posed is only relevant if you can communicate to the animal a faster more fuel efficient method of arriving at the desired outcome (which means it can learn from you) making the entire exercise pointless and not worth doing ....
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VileReynard
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Re: Very challenging Higher Maths Question - apparently

This question was set by an idiot.
Crocodiles attack their prey by attacking from water and dragging it underwater so it drowns.
They also "stalk their prey" by swimming slowly & stealthily i.e. slowly.
The land speed record for a crocodile is 17 km/h (11 mph) [Wikipedia].
Since the drawing indicates a zebra (which are quite speedy animals), the crocodile has no chance if it tries to chase it on land.
Not even if it can do differential calculus.

Superuser
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Re: Very challenging Higher Maths Question - apparently

I'm sure the examiner would be impressed if that was submitted as the answer. Tongue
David