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At the same time, Jim and Tony biked from home to their

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Director
Joined: 17 Oct 2005
Posts: 928
At the same time, Jim and Tony biked from home to their [#permalink]

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12 Jan 2006, 05:53
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At the same time, Jim and Tony biked from home to their school. If their respective speed in the whole trip are constant, how much time earlier will Jim arrive than Tony?

1) The distance between home and school is 200 miles
2) Jim bikes 10 miles per hour faster than Tony
Director
Joined: 13 Nov 2003
Posts: 789
Location: BULGARIA

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12 Jan 2006, 06:04
E) We do not know the ratio between their respective speeds
SVP
Joined: 28 Dec 2005
Posts: 1558

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12 Jan 2006, 07:38
its between C or E, but I am going with E, because as BG mentioned, we dont know what those relative speeds were, and without that info we cannot calculate a definite time.
Manager
Joined: 19 Jul 2005
Posts: 67
Location: Atlanta

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12 Jan 2006, 09:49
E. Need some way to figure out Tony's speed, right?
VP
Joined: 20 Sep 2005
Posts: 1017

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12 Jan 2006, 11:35
E. We need speed of one of the cyclists. Their relative constant speeds aren't enought to solve for time.
Director
Joined: 04 Oct 2005
Posts: 582
Location: Chicago

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13 Jan 2006, 00:21
E... both r INSUFF...we need to know the speeds.
Director
Joined: 17 Oct 2005
Posts: 928

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13 Jan 2006, 04:59
oa is E

n=speed of tony
m=speed of mary

s=d/t

abs(d/m-d/n) = d(n-m)/mn

I. dont know what m, n are

II. dont know what m,n or d are

both. dont know what m, n are.
Director
Joined: 10 Oct 2005
Posts: 718

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13 Jan 2006, 05:24
joemama142000 wrote:
At the same time, Jim and Tony biked from home to their school. If their respective speed in the whole trip are constant, how much time earlier will Jim arrive than Tony?

1) The distance between home and school is 200 miles
2) Jim bikes 10 miles per hour faster than Tony

E simple reasoning
1)insuf cause we don't know distance between (which )home and school is 200 miles
2) Jim bikes 10 miles per hour faster than Tony[/quote]Insuff cause we don't know whats Tony's speed
Hence E
Intern
Joined: 10 Jan 2006
Posts: 6

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13 Jan 2006, 14:38
e becuse we dont know either person's rate (necessary for solving the eqquation) or at least a ratio between their rates so we can respond with a ratio (ie m=1/2t)

kind of an easy one, no?
Intern
Joined: 10 Jan 2006
Posts: 6

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13 Jan 2006, 14:39
Yurik79, it can be inferred from the question stem that both homes are 200m from the school (I hope!!)
13 Jan 2006, 14:39
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