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by divya23 » Thu Jun 09, 2011 8:10 am
on her wayback home janet drives back thru several toll booths is dere a pair of dese t.b are less than 10 miles apart?
1. 1st tb and last tb are 25 miles apart.
2.she drives total of 4 tb

[spoiler]ans = both[/spoiler]
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Source: — Data Sufficiency |
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by cans » Thu Jun 09, 2011 8:19 am
pair of t.b. < 10 miles
a)1st and last are 25 miles
we don't know the number. maybe last is the second. then distance >10
maybe last is 25th and each pair s 1 mile apart. then distance <10
insufficient
b)total 4tb.
for every pair to be more than 10 mile apart, first and last booth should be 30 miles apart.
But they are only 25 miles apart
Thus atleast one pair <10 mile
IMO C
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by Frankenstein » Thu Jun 09, 2011 8:22 am
Hi,
From(1): We do not know how many toll booths are there. Not enough info. to tell
Insufficient
From(2): We do not know any distances.Not enough info. to tell
Insufficient
Both(1)&(2): Let the distances between successive toll booths be a,b,c
So, a+b+c = 25
At least one of a,b,c has to be less than 10.
Sufficient

Hence, C

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