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

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Manager
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At what speed was a train travelling on a trip when it had [#permalink] New post 03 Jun 2005, 11:27
00:00
A
B
C
D
E

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(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.
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 [#permalink] New post 03 Jun 2005, 11:49
E it is....

the train could go fast in the first half the trip and then slow down...
or vice versa
Senior Manager
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Re: DS-speed [#permalink] New post 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
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 [#permalink] New post 03 Jun 2005, 17:03
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
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 [#permalink] New post 04 Jun 2005, 05:34
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
  [#permalink] 04 Jun 2005, 05:34
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