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The Middlebury train station is between the Appleton and Lancaster sta

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The Middlebury train station is between the Appleton and Lancaster sta  [#permalink]

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New post Updated on: 03 Oct 2018, 20:58
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The Middlebury train station is between the Appleton and Lancaster stations and all three are serviced by the same track. What is the distance between Middlebury and Lancaster?


(1) If a train can travel 50 miles on one pound of coal, it will use twice as much coal traveling from MiddleBury to Lancaster as it will use to travel between Middlebury and Appleton.

(2) Traveling from Appleton to Middlebury at an average rate of 35 mph takes 30 minutes longer than at an average rate of 55 mph.

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Originally posted by gmat1393 on 03 Oct 2018, 20:19.
Last edited by Bunuel on 03 Oct 2018, 20:58, edited 1 time in total.
Renamed the topic.
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Re: The Middlebury train station is between the Appleton and Lancaster sta  [#permalink]

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New post 03 Oct 2018, 22:45
gmat1393 wrote:
The Middlebury train station is between the Appleton and Lancaster stations and all three are serviced by the same track. What is the distance between Middlebury and Lancaster?


(1) If a train can travel 50 miles on one pound of coal, it will use twice as much coal traveling from MiddleBury to Lancaster as it will use to travel between Middlebury and Appleton.

(2) Traveling from Appleton to Middlebury at an average rate of 35 mph takes 30 minutes longer than at an average rate of 55 mph.


Questions involving distance will likely be based either on the speed*time=distance equation or some kind of ratio/subtraction between the whole (Appleton-Lancaster) and its parts (Appleton-Middlebury, Middlebury-Lancaster).
We'll look for these pieces of information, a Logical approach.

(1) This gives us the ratios between the distances, not exact numbers.
Insufficient.

(2) This lets us calculate the Appleton-Middlebury distance (as we can create an equation with 1 variable) which is insufficient on its own.
Insufficient.

Combined:
(2) gives us the Appleton-Middlebury distance and (1) gives us the ratio between the Appleton-Middlebury to Middlebury- Lancaster distances.
Sufficient!

(C) is our answer.
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Re: The Middlebury train station is between the Appleton and Lancaster sta  [#permalink]

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New post 03 Oct 2018, 22:48
The Middlebury train station is between the Appleton and Lancaster stations and all three are serviced by the same track. What is the distance between Middlebury and Lancaster?


(1) If a train can travel 50 miles on one pound of coal, it will use twice as much coal traveling from MiddleBury to Lancaster as it will use to travel between Middlebury and Appleton.
This tells us that the distance between M and A is twice the distance between M and L
A....-2x-....M..-x-..L
But nothing about x
insuff

(2) Traveling from Appleton to Middlebury at an average rate of 35 mph takes 30 minutes longer than at an average rate of 55 mph.
distance between A to M be y, so \(\frac{y}{35}=\frac{y}{55}+\frac{1}{2}\)
we will get value of y from here that is the distance between A and M
BUt nothing about distance between M and L
insuff

combined
y=2x= we will know y from statement II
distance between M and L \(= \frac{y}{2}\)
sufficient as we know what is y

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2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: The Middlebury train station is between the Appleton and Lancaster sta &nbs [#permalink] 03 Oct 2018, 22:48
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