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A certain expressway has exits J, K, L and M in that order

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A certain expressway has exits J, K, L and M in that order [#permalink] New post 30 Dec 2006, 23:42
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

62% (01:35) correct 38% (00:21) wrong based on 69 sessions
A certain expressway has Exits J, K, L, and M, in that order. What is the road distance from Exit K to Exit L?

(1) The road distance from Exit J to Exit L is 21 kilometers.
(2) The road distance from Exit K to Exit M is 26 kilometers.

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Re: DS: Distance Question (OG 11 Q13) [#permalink] New post 31 Dec 2006, 00:34
a529612 wrote:
A certain expressway has exits J, K, L and M in that order. What is the road distance from exit K to exit L?

1) The road distance from exit J to exit L is 21km.

2) The road distance from exit K to exit M is 26km.

Why is E the correct answer and not C? I got KL as 5km (26-21 overlap) and hence answer C. Thanks!


If you use both (1) and (2), you see that even if JL and KM are given, there´s nothing conclusive about KL. JL and KM could overlap completely OR just partially. Thus E.
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 [#permalink] New post 16 Jan 2007, 07:10
E

JK+KL=21
KL+LM=26

we need to know something else
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 [#permalink] New post 12 Aug 2007, 09:26
i chose E.

drawing a number line was helpful to me. if J is at zero and L is at 21, K could be anywhere from 1 to 20 with M being anywhere from 27 to 46. the distance from K to L would change depending on where K and M are on the number line.
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 [#permalink] New post 13 Aug 2007, 02:02
Easiest way is to draw a picture

draw J K L & M

Then draw an arch from J to K, label it 21
then an arc from K to M

You want the distance from K to L, but L can be anywhere between K & M.... quick E
  [#permalink] 13 Aug 2007, 02:02
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A certain expressway has exits J, K, L and M in that order

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