Primary one maths question???

If it takes 22 mins 30 seconds to run 2.2miles.

What is the average speed of the runner?

Now I know, it's distance/time to find speed. It's the whole conversion thing stumping me. Blonde day!

22m 30s is 37.5% of 60 mins/1 hour

Trying to work out what to divide... argh!!!

It's giving me a headache. Any chance, someone can **** me and then give me the answer... pleaseeee.

Also...

How quickly would you have to run in order to do 2.2 miles in under 19 minutes?

Cheers

Huh, is this an actual school question? Even though the units don't make a difference to the working I'm pretty sure it was metric all the way when I was in school.
 
dont remember doing anything by cauchy in my further maths. is this uni stuff, or has the A level curriculum changed again?

Uni stuff. If you need to integrate around a closed contour, you can find the value of the integral by calculating something called the residue at certain points within the contour. Been a while since I did that though!
 
Here is a conversion strategy(by first principals) i learnt i think in p.5 and has never failed me
It goes as follows.

Assume there are xhr in 22.5minutes, then find x.


if 1hr = 60minutes
therefore xhr = 22.5minutes

by cross multiplication

--> 22.5min * 1hr = 60min * xhr

--> 22.5min(hr) = 60min(xhr)

--> 22.5min(hr)/60min = 60min (xhr)/60min

all the min/min cancle out

--> xhr = (22.5/60)hr

xhr = 0.375hr


Conversion Problem solved.
 
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I am using this thread for my own question, rather than open a new one. I am trying to convert "Miles Per Gallon" to "Litres per 100km" (measurement they use in Germany) to compare to my colleague overseas. If I tank up at 153 miles and used 3.5 US gallons, it is pretty easy 43.7 MPG. How do I convert this to litres per 100 km?

246.2 km
13.2 litres

It is the 100km that is throwing me off. :o

edit: nevermind. I didn't move the decimal over far enough. 13.2 / 2.462 = 5.36 liters per 100 km.
 
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If p1 is for 5 year olds as people say, that seems quite hard tbh... I'm fairly sure I didn't do anything like that when I was 5 !
 
Right.

A) P1 refers to Primary 1, so in Scotland you have P1 through to P7, each number being the year in Primary school.

B) Then it goes to S1 through to S6, for each year in Secondary school

C) The OP was being sarcastic with his reference to a P1 maths question, do you really think 4-5 year olds are being taught distance over time equations?!! lol.
 
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