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