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todays brain teaser

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By *layfullsam OP   Man
over a year ago

Solihull

a man drives for half a journey at 12mph and then completes the rest of the journey on foot at 4mph

what was his average speed and how have you worked it out

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By (user no longer on site)
over a year ago

8mph. 12 + 4 / 2.

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By (user no longer on site)
over a year ago

6mph and he's going up hill????

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By *layfullsam OP   Man
over a year ago

Solihull


"8mph. 12 + 4 / 2.

"

its not 8

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By (user no longer on site)
over a year ago

i will go for 16 divided by 2 = 8mph

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By *layfullsam OP   Man
over a year ago

Solihull


"6mph and he's going up hill????"

lol no hills and the car hasnt broken down

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By (user no longer on site)
over a year ago

How long is the journey?

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By (user no longer on site)
over a year ago


"a man drives for half a journey at 12mph and then completes the rest of the journey on foot at 4mph

what was his average speed and how have you worked it out

"

Rest o journey is 4 miles so whole must be 8. 16 :2 or ....... My brain hurts

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By *iamondsmiles.Woman
over a year ago

little house on the praire

How are is he going

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By *layfullsam OP   Man
over a year ago

Solihull


"i will go for 16 divided by 2 = 8mph"

sorry its not 8mph

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By *layfullsam OP   Man
over a year ago

Solihull


"How are is he going"

all the way

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By *uro anchorMan
over a year ago

Coventry

12 + 4 devide by the two 8 unless its a trick...

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By (user no longer on site)
over a year ago

[Removed by poster at 21/11/12 11:16:00]

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By (user no longer on site)
over a year ago


"i will go for 16 divided by 2 = 8mph

sorry its not 8mph"

It's has to be ..... Ok where is the trick?

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By (user no longer on site)
over a year ago

is he walking backwards

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By *layfullsam OP   Man
over a year ago

Solihull


"12 + 4 devide by the two 8 unless its a trick..."

not a trick and not 8mph, got to log off for a while have fun working it out

mr googles alowed if everyones stuck

lollipop for the winner

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By (user no longer on site)
over a year ago


"12 + 4 devide by the two 8 unless its a trick..."

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By *layfullsam OP   Man
over a year ago

Solihull


"12 + 4 devide by the two 8 unless its a trick... "

Noooooooooo

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By (user no longer on site)
over a year ago

I wanna know now or I am gonna throw me dummy out

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By (user no longer on site)
over a year ago

its on Johnny balls brain teaser its 6 how though god no,s

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By *histler21Man
over a year ago

Ipswich

Man travels the first half the journey at 12 mph. The second part is travelled at 4 mph - but this takes 3 times as long - therefore you can average out the speeds i.e.

(12+4+4+4)/4 = 6

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By (user no longer on site)
over a year ago


"Man travels the first half the journey at 12 mph. The second part is travelled at 4 mph - but this takes 3 times as long - therefore you can average out the speeds i.e.

(12+4+4+4)/4 = 6"

Eeeeeeeeeeee ba gum lad!

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By (user no longer on site)
over a year ago

6 mph---- one hour to go 12 miles and then 3 hours to go 12 miles so its 12 plus 12 divided by 4 --- equals six -- well i hope so -- i would now like to clai my prize of a nithg with your wife LOL

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By (user no longer on site)
over a year ago


"6 mph---- one hour to go 12 miles and then 3 hours to go 12 miles so its 12 plus 12 divided by 4 --- equals six -- well i hope so -- i would now like to clai my prize of a nithg with your wife LOL"
Bugger! Got there before me

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By *histler21Man
over a year ago

Ipswich


"6 mph---- one hour to go 12 miles and then 3 hours to go 12 miles so its 12 plus 12 divided by 4 --- equals six -- well i hope so -- i would now like to clai my prize of a nithg with your wife LOL Bugger! Got there before me

"

S'ok Perky - you can commiserate with me...

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By (user no longer on site)
over a year ago

sorry pork -- just sitting here bored LOL

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By (user no longer on site)
over a year ago


"sorry pork -- just sitting here bored LOL"
No need to apologise. Award yourself a house point, Starman

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By *edonism44Man
over a year ago

oldham

12 divided by 4 gives average goes 3 half the journey expressed as a fraction is 1/2 , therefore average speed is 3x2

6 mph

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By *londeCazWoman
over a year ago

Arse End of the Universe, Cumbria

Obviously a tourist driving in the Lake District if doing 12 mph - it's sooooo annoying being stuck behind them on our twisty fecking roads

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By *histler21Man
over a year ago

Ipswich


"12 divided by 4 gives average goes 3 half the journey expressed as a fraction is 1/2 , therefore average speed is 3x2

6 mph "

Why did you divide 12 by 4?

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By *layfullsam OP   Man
over a year ago

Solihull

Congratulations to all of the bright sparks who got the correct answer of 6 i am suitably impressed

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By (user no longer on site)
over a year ago


"Congratulations to all of the bright sparks who got the correct answer of 6 i am suitably impressed"
Thankyou!!

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By *nJ_NW_cplCouple
over a year ago

wirral


"12 divided by 4 gives average goes 3 half the journey expressed as a fraction is 1/2 , therefore average speed is 3x2

6 mph

Why did you divide 12 by 4?"

If half the journey is done at 12 mph and the other half at 4mph then the total journey is 4 parts long. 1 at 12mph and 3 at 4mph (to make it equal to the first half i.e. 12mph) therefore divide by 12 by 4 to get the average.

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By *histler21Man
over a year ago

Ipswich


"12 divided by 4 gives average goes 3 half the journey expressed as a fraction is 1/2 , therefore average speed is 3x2

6 mph

Why did you divide 12 by 4?

If half the journey is done at 12 mph and the other half at 4mph then the total journey is 4 parts long. 1 at 12mph and 3 at 4mph (to make it equal to the first half i.e. 12mph) therefore divide by 12 by 4 to get the average."

Basically the same way as I did it. But you should always show your working out.

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