The Old Man And The Street

koal · 2003-07-14, 11:49

An old man leaves a pub and starts to "walk" home. The man's speed is 3 km/h and his poor little house lies outside the village (the exact distance pub-house is 4.5 km).

When the man starts, his dog runs home and back to him on an on, at a speed twice as the old man's speed. So the distances, the dog is running between the man and his house are decreasing until the distance is zero and they both arrive at the tiny old house of the old man.

Premium question: what distance does the dog run? 8)

Orgasmic Troll · 2003-07-14, 13:52

9 km .. assuming the man returning from the pub can walk in a straight line ;)

koal · 2003-07-14, 20:13

How did you sum up the partial distances of the dog? ;)

Gary Edstrom · 2003-07-14, 20:20

Quote:

Originally Posted by koal

How did you sum up the partial distances of the dog? ;)

You don't need to sum any series, and the 3km speed is irrelevant. The dog is runing twice as fast as the man. So in the time that the man walks the 4.5km to home, the do will travel twice that far or 9km.

alienz · 2003-07-14, 21:01

Xyzzy · 2003-07-15, 02:46

Quote:

Originally Posted by Gary Edstrom

You don't need to sum any series, and the 3km speed is irrelevant. The dog is runing twice as fast as the man. So in the time that the man walks the 4.5km to home, the do will travel twice that far or 9km.

What speed is the dog going when he changes directions?

cheesehead · 2003-07-15, 05:47

Quote:

Originally Posted by Xyzzy

What speed is the dog going when he changes directions?

Twice the speed the man is going when he changes directions. :)

Xyzzy · 2003-07-15, 09:18

Huh?

Does the man change directions?

eepiccolo · 2003-07-15, 12:08

Quote:

Originally Posted by Xyzzy

Huh?

Does the man change directions?

Yeah, when he finds a five dollar bill on the ground and goes back to the pub

;) :D .

Orgasmic Troll · 2003-07-15, 13:49

Wouldn't it be a five-pound note? or do they take american currency in the UK?

eepiccolo · 2003-07-15, 14:09

Because koal is from Austria, I guess it would be a five-euro note. :D

2003-07-14, 11:49	#1
koal Nov 2002 Vienna, Austria 51₈ Posts	The Old Man And The Street An old man leaves a pub and starts to "walk" home. The man's speed is 3 km/h and his poor little house lies outside the village (the exact distance pub-house is 4.5 km). When the man starts, his dog runs home and back to him on an on, at a speed twice as the old man's speed. So the distances, the dog is running between the man and his house are decreasing until the distance is zero and they both arrive at the tiny old house of the old man. Premium question: what distance does the dog run? 8)

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2003-07-14, 13:52	#2
Orgasmic Troll Cranksta Rap Ayatollah Jul 2003 641 Posts	9 km .. assuming the man returning from the pub can walk in a straight line ;)

2003-07-14, 20:13	#3
koal Nov 2002 Vienna, Austria 41 Posts	How did you sum up the partial distances of the dog? ;)

2003-07-15, 09:18	#8
Xyzzy "Mike" Aug 2002 2⁵×257 Posts	Huh? Does the man change directions?

2003-07-15, 13:49	#10
Orgasmic Troll Cranksta Rap Ayatollah Jul 2003 1010000001₂ Posts	Wouldn't it be a five-pound note? or do they take american currency in the UK?

2003-07-15, 14:09	#11
eepiccolo Dec 2002 Frederick County, MD 2×5×37 Posts	Because koal is from Austria, I guess it would be a five-euro note. :D

2003-07-14, 21:01	#5
alienz Jun 2003 3·7 Posts