Jim01234567890 wrote:I, too, initially selected E as the answer, but don't understand how we're assuming Janet's path home is a straight line (ie each segment from A-D). Although I thoroughly understand C, I answered E because if not a straight line and without information on total distance covered or additional information about the locations of specific toll booths, there is not enough information, without assuming, to conclude on C.
Any help to clarify would be appreciated!
The phrase
10 miles apart means -- at least to me -- 10 miles along the road being driven.
Pakaskwa used the strategy that I would use to solve this DS question.
When a question gives an upper or lower limit, plug in the limit in order to see how the problem is restricted.
The limit given in this problem is 10 miles: we're being asked whether the distance between any pair of tollbooths is less than this distance. So, in order to see how the problem is restricted, we should plug in 10 miles for the distance between each pair of tollbooths.
When the 2 statements are combined, we know from statement 2 that there are 4 tollbooths. If there are 10 miles between each pair, the total distance = 10+10+10 = 30. But statement 1 states that the total distance = 25. Thus, we know that the distance between at least one of the 3 pairs must be less than 10.
The correct answer is
C.
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