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Peter can drive

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Peter can drive

by gmat25 » Fri Jul 29, 2011 10:55 am
Peter can drive to work via the expressway or via the backroads, which is a less delay-prone route to work. What is the difference in the time Peter would spend driving to work via the expressway versus the backroads?

(A) Peter always drives 60mph, regardless of which route he takes; it takes Peter an hour to drive round-trip to and from work using the backroads

(B) If Peter travels to and from work on the expressway, he spends a total of 2/3 of an hour traveling

my doubt is, can we actually assume that Peter take equal time while going to office and coming back to office on a same expressway?? If we can assume this then the answer would be Op C otherwise Op E. Please clear
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by edge » Fri Jul 29, 2011 6:02 pm
My answer is C.

St1 gives us no information about time spent on the expressway.
St2 gives us no information about time spent on the backroads.

Combining them, we can see that Peter spends 20 more minutes on the backroads traveling at 60mph on his chosen route.
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by jaymw » Sat Jul 30, 2011 1:46 am
Peter can drive to work via the expressway or via the backroads, which is a less delay-prone route to work. What is the difference in the time Peter would spend driving to work via the expressway versus the backroads?

(A) Peter always drives 60mph, regardless of which route he takes; it takes Peter an hour to drive round-trip to and from work using the backroads

(B) If Peter travels to and from work on the expressway, he spends a total of 2/3 of an hour traveling

my doubt is, can we actually assume that Peter take equal time while going to office and coming back to office on a same expressway?? If we can assume this then the answer would be Op C otherwise Op E. Please clear
I think we cannot assume that the ways to and from work will take the same amount of time. The reason why I think so is the following sentence in the prompt:

"Peter can drive to work via the expressway or via the backroads, which is a less delay-prone route to work."

Perhaps, on the way back, the two roads are equally delay-prone. Perhaps, on the way back, the expressway is not delay-prone at all and Peter spends 30 minutes to work on the expressway and only 10 minutes to go back. The prompt only tells us something about the way TO work, but nothing about the way back.

Using this logic, the answer should be E, but I am curious to hear what the OA is. By the way, what is the source of this question?
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by edge » Sat Jul 30, 2011 5:32 pm
jaymw wrote:Using this logic, the answer should be E, but I am curious to hear what the OA is. By the way, what is the source of this question?
jaymw: Link.
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by jaymw » Sun Jul 31, 2011 3:53 am
edge wrote:
jaymw wrote:Using this logic, the answer should be E, but I am curious to hear what the OA is. By the way, what is the source of this question?
jaymw: Link.
Thanks for the link. However, I have never heard of PlatinumGMAT, so I don't know if it's "safe" to study from this source. I believe that an actual GMAT question would be much more clearly worded.
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