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

Registered: 11/26/00
Posts: 17584
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?
_________________________
A true friend is a friend in spite of, not because of.

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

Registered: 01/16/03
Posts: 5349
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: 17584
Loc: Ottawa Ontario Canada
Meowwwwwwwwwwwwwwwwwww !!
_________________________
A true friend is a friend in spite of, not because of.

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