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john (from arran)

2nd August 2009, 17:05
Hmmm yes, lazy Sunday! We'll never get to 200 posts if you don't all pull your socks up!

Here's how you do it:

We know that the motorcyclist ends up 20 miles from where he started, so let's call the extra distance he travelled before he turned X. So he covered 20 + X miles from his starting place
at the back to the front of the line and he covered X miles back again.

Let V and v be the velocities of the motorcyclist and of the vehicles respectively.

So the time to go from back to front is:

(20+X)/V = X/v

and the time to go from front to back again is:

X/V = (20-X)/v

By rearranging those equations we get:

(20+X)/X = X/(20-X) = V/v

so:

X^2 = (20 + X)*(20 - X)

X^2 = 400 + (20 * X) - (20 * X) - X^2

X^2 = 200

X = sqrt(200)

Thus the motorcycle has travelled

20 + (2 * sqrt(200)) = 48.284 miles
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jimb

2nd August 2009, 17:06
John from A

Based on the 20 mile distance on his return then I guess that the end of the line must have been 10 miles from the starting point as he reacvhed the front so he must have travelled 30 mile. His return trip took him back to the 20 mile point a distance of 10 miles, therefore, total miles = 40??

JimB

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campanilla

2nd August 2009, 17:43
This thread is becoming very machistic. An awful lot more information is required to be able to work it out logically and accurately, for example:

1. Where are the loos siutuated along the route?
2. Where, when and for how long will we stop for morning coffee?
3. Is there a Sainsbury's or Marks and Spencers along the route (will need to pick up a few things for dinner)?
4. If passing a dress shop with a sale on and some fantastic bargains are to be had, how long will the convoy stop?
5. If best friends' house is two miles along a side street, is a detour permitted?
6. Will those nasty helmets which flatten the best of hairdos be mandatory?
7. Will the motorcyle have heated handgrips?
8. Can the convoy go on its own if it's raining?
9. When and where is lunch being served? (Burger King or McDonalds not being options).

You see, you men never, ever give enough important information!!
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jimb

2nd August 2009, 18:10
Nice one Campo!

Cut straight to the important issues. You obviously graduated from the standard "let's enjoy the trip" school of (feminine) logic.

Jimbo
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the joker

2nd August 2009, 18:10
T SHIRTS spotted being worn by POSERS OF THE DAY. This should get the posts well on the way to 200.

I have kleptomania,
But when it gets bad,
I take something for it.
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terry

2nd August 2009, 18:12
My wife walked out on me because I'm a compulsive gambler. How can I win her back?
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jimb

2nd August 2009, 18:30
Terry

Is it really her back you want?

JimB
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john (from arran)

2nd August 2009, 19:56
Oh campanilla. You have posted no less than nine posers in one message. How are we going know when 200 arrives now? You also missed out some vital questions:

1. Will the motorcycle have enough power to work the straightening/curling tongs?

2. How long after the anticipated starting time will it be before the motorcyclist's partner is actually ready to leave.

3. Do we have enough sunblock, or should we buy another three tubes just to be sure?

4. Do we have enough midge repellant? (See 3 above).

5. Is there a place to buy a new teapot, because the one we bought last week isn't quite the right colour?

I could go on......
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campanilla

2nd August 2009, 20:32
See John, you've totally got the hang of it now. If we had had all that absolutely vital information at the beginning it would have been so easy to work out 48.284 miles. Do remember this for future brain teasers. Oh and by the way, could we please drop all those silly little x's and y thingys and perhaps use little hearts and clubs and things like Mamya uses, so much prettier don't you think?
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terry

2nd August 2009, 20:46
maths (as taught in schools these days)seems to have changed a bit. Sample question from recent exam:-
If David has 6 sweets and Peter has 4, How many times must David hit Peter before he has 10 sweets.

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