maths based riddles... See if you can answer them.
Discussion
Your girlfriend/wife/female partner says
"look, my new pair of shoes were a bargain, only cost £350"
Resolve the equation, showing all your working, that mathematically demonstrates why any attempt to argue or comment about the relative magnitude and vectors of "a bargin" will result in "the doghouse" regardless of the actual starting node condition. (extra points will be awarded for an accurately filled in "Truth table" for said scenario)
"look, my new pair of shoes were a bargain, only cost £350"
Resolve the equation, showing all your working, that mathematically demonstrates why any attempt to argue or comment about the relative magnitude and vectors of "a bargin" will result in "the doghouse" regardless of the actual starting node condition. (extra points will be awarded for an accurately filled in "Truth table" for said scenario)
illmonkey said:
I still don't get the 2 minute time limit.
Einion Yrth said:
Two miles and two miles only. To average 60 over the course of two miles I have to complete the course in 2 minutes. I have already taken two minutes doing the 1st lap at an average of 30. Ergo I am out of time and it cannot be done.
HTH. If not I'll have another stab - but that seems clear to me.
illmonkey said:
Einion Yrth said:
HTH. If not I'll have another stab - but that seems clear to me.
I was talking to the OP. His post does not mention it being done in 2 minutes. I'm probably being a thicky thick thick.
illmonkey said:
Einion Yrth said:
HTH. If not I'll have another stab - but that seems clear to me.
I was talking to the OP. His post does not mention it being done in 2 minutes. I'm probably being a thicky thick thick.Just because something is not said, it can be an assumption in your hypothesis or educated guess and then come to the conclusion that it is impossible.
illmonkey said:
Einion Yrth said:
HTH. If not I'll have another stab - but that seems clear to me.
I was talking to the OP. His post does not mention it being done in 2 minutes. I'm probably being a thicky thick thick.60mph is 1 mile a minute. So to average 60 mph for two miles, you must take exactly 2 minutes to complete the journey. Thus, once the traveller starts their journey, they have 2 minutes to finish it. If they take more than two minutes, they average less than 60mph.
30mph, being half of 60mph, means that the first lap took twice as long as needed to make the average. So the first lap took 2 minutes. Thus no matter how fast he completes the second lap, the total time is going to be 2 minutes plus x seconds, and thus have an average speed of less than 60mph.
Those saying 90 are looking at the total distance but ignoring the total time, the majority of which would be spent travelling at 30mph. If you drove at 30mph for 2 minutes, and then drove at 90mph also for 2 minutes, then your average speed will be 60mph, but you will have travelled more than two miles.... or is that wrong too?
Edited by Alfanatic on Monday 15th August 13:05
doogz said:
Einion Yrth said:
doogz said:
Why are manhole covers round?
Not so much a maths problem, as it is a logic one.
And if you've heard it, don't spoil it.
How do you propose to tell the difference between someone who has just worked it out and someone who worked it out some time ago?Not so much a maths problem, as it is a logic one.
And if you've heard it, don't spoil it.
I just figured it you already know the answer, you don't need to spoil it for others.
And no, they're not all round, but some are. And there's a fairly good logical reason for it.
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