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# At what speed was a train travelling on a trip when it had

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Manager
Joined: 12 Jul 2003
Posts: 198
Followers: 1

Kudos [?]: 14 [0], given: 0

At what speed was a train travelling on a trip when it had [#permalink]  03 Jun 2005, 11:27
00:00

Difficulty:

(N/A)

Question Stats:

100% (02:51) correct 0% (00:00) wrong based on 1 sessions
At what speed was a train travelling on a trip when it had completed half of the total distance of the trip?

1)The trip was 460 mileslong and took 4 hours to complete
2)the train travelled at an average rate of 115 miles per hour on the trip

Best.
Current Student
Joined: 28 Dec 2004
Posts: 3391
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 181 [0], given: 2

E it is....

the train could go fast in the first half the trip and then slow down...
or vice versa
Senior Manager
Joined: 17 May 2005
Posts: 272
Location: Auckland, New Zealand
Followers: 1

Kudos [?]: 5 [0], given: 0

Re: DS-speed [#permalink]  03 Jun 2005, 12:08
doloris wrote:
At what speed was a train travelling on a trip when it had completed half of the total distance of the trip?

1)The trip was 460 mileslong and took 4 hours to complete
2)the train travelled at an average rate of 115 miles per hour on the trip

Best.

I pick E too as neither statement gives any information about what the speed would be at any particular time...
Manager
Joined: 07 Mar 2005
Posts: 93
Followers: 1

Kudos [?]: 8 [0], given: 0

E as well. Average rate tells you nothing about how fast something is going at a particular point in time.

anytime you see average think of

(2+9999+5+3+7654)/5 <---- Random Speeds
Director
Joined: 18 Feb 2005
Posts: 674
Followers: 1

Kudos [?]: 2 [0], given: 0

E.....

1)The trip was 460 mileslong and took 4 hours to complete
Not sufficient because it may had variables speeds....

2)the train travelled at an average rate of 115 miles per hour on the trip

Avg rate doesnt mean that the train travelled at that pace necessarily
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