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Offlineegghead
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Registered: 04/25/01
Posts: 1,054
Loc: Milky Way
Last seen: 22 years, 2 months
spore contest
    #362439 - 07/28/01 09:32 AM (22 years, 10 months ago)

First correct reply gets two pc prints..

Given:
Two trains are on a collision course are 12.8 miles apart. The track is perfectly straight and level. One train is traveling 3.3 mph the other, 4.1 mph. Now, it seems there is a fly that is flying back and forth from train to train at an average speed of 11.8 mph.

Determine:
How far does the fly travel before it is smashed between the locomotive engines?

Show your work for a bonus print!



The day I tried to live; I stole a thousand beggar's change and gave it to the rich.


--------------------
Where there's skill, there's a better way..

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Offlineskoal
Stranger
Registered: 05/21/01
Posts: 19
Last seen: 22 years, 8 months
Re: spore contest [Re: egghead]
    #362450 - 07/28/01 10:05 AM (22 years, 10 months ago)

Ok..how about this. The fly will travel about 16.992 miles before the trains intersect and kill it. Because it will take the trains about 1 hour and 44 minutes to intersect. I kinda rounded a few numbers but..that should be close enough. Am i right?


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OfflineCarlos
Cyclist

Registered: 07/20/01
Posts: 9
Last seen: 20 years, 5 months
Re: spore contest [Re: egghead]
    #362453 - 07/28/01 10:14 AM (22 years, 10 months ago)

Vector sum of trains A and B = (3.3 + 4.1) = 7.4 MpH

Time for trains to collide = (12.8M / 7.4MpH) = 1.73 Hours

Distance covered by the fly until the trains collide
= 1.73H * 11.8M/H = 20.41 Miles

Mmmm - I can just taste those pc's now! :-)


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Offlineartdeco
Stranger
Registered: 07/27/01
Posts: 4
Last seen: 22 years, 4 months
Re: spore contest [Re: egghead]
    #362467 - 07/28/01 10:54 AM (22 years, 10 months ago)

The question is kinda vague. Are the trains heading in the same direction?


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Offlineegghead
veteran
Registered: 04/25/01
Posts: 1,054
Loc: Milky Way
Last seen: 22 years, 2 months
Re: spore contest [Re: egghead]
    #362477 - 07/28/01 11:20 AM (22 years, 10 months ago)

skoal.. That's some bigtime rounding, but close enough for mycology. ;)

Carlos.. Nice work/explaination.

Two winners! PM me your shipping addys. If you get them to me quick enough I'll ship today.

artdeco.. No, not in same direction, in opposite directions. They're traveling toward the same collision point, though.

Silly math riddles.. Thanks for playing. :)

The day I tried to live; I stole a thousand beggar's change and gave it to the rich.


--------------------
Where there's skill, there's a better way..

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