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#863068 - 01/19/13 01:39 PM Choo choo...Meow!
CanukDenis Offline
Graduate Boomer

Registered: 11/26/00
Posts: 17521
Loc: Ottawa Ontario Canada
T>..............[A]........F.............[B]

Train T is approaching tunnel AB.

Inside the tunnel is Felix The Cat located at point 3/8th
of the distance AB measured from the entrance A.

When the train whistles, Felix runs.

If Felix runs West, the train hits Felix exactly at the entrance A.

If Felix runs East, the train hits Felix exactly at the exit B.

If Felix's speed is 10 mph, what is the train's speed?
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A true friend steps in when the rest of the world steps out.

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#863144 - 01/19/13 09:50 PM Re: Choo choo...Meow! [Re: CanukDenis]
CCbomber Online   content
BAAG Specialist

Registered: 01/16/03
Posts: 5301
Loc: Mojave desert, California
T>..............[A]........F.............[B]

AB = distance from A to B
TA = distance from the train to A
s = speed of the train

10 mph/s = 3AB/8TA = 5AB/8(TA+AB)

From the right equation, TA = (3/2)AB
Substituting into the left equation, s = 40 mph

thanks

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#863170 - 01/19/13 11:56 PM Re: Choo choo...Meow! [Re: CanukDenis]
CanukDenis Offline
Graduate Boomer

Registered: 11/26/00
Posts: 17521
Loc: Ottawa Ontario Canada
Meowwwwwwwwwwwwwwwwwww !!
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A true friend steps in when the rest of the world steps out.

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