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# BS: Passing Ships

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GMAT Instructor
Joined: 04 Jul 2006
Posts: 1259

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14 Jul 2006, 07:18
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This topic is locked. If you want to discuss this question please re-post it in the respective forum.

The above rectangle is a channel that in broken into 8 identical square sectors. Boats A and B are at opposite ends of the channel. They begin sailing at the same time, and go back and forth parallel to the shores from one end of the channel to the other. Neither boat varies its speed at any time and the time each boat spends turning around is negligible. In which sector will they pass each other for the second time?

(1) They pass for the first time in sector 7.
(2) They pass for the third time in sector 3.
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channel.doc [27 KiB]

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Intern
Joined: 11 Jul 2006
Posts: 37

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Location: Boston

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14 Jul 2006, 07:50
Consider (1)
Indicates that when A covers 7 blocks, B covers 2 blocks, this is sufficient to say where they will intersect again.
So (1) is sufficient.

Consider (2)
This does not give any information about their relative speeds and is not sufficient.

ANS â€“ (1) Alone is sufficient.

Cheers,
Anand

kevincan wrote:
The above rectangle is a channel that in broken into 8 identical square sectors. Boats A and B are at opposite ends of the channel. They begin sailing at the same time, and go back and forth parallel to the shores from one end of the channel to the other. Neither boat varies its speed at any time and the time each boat spends turning around is negligible. In which sector will they pass each other for the second time?

(1) They pass for the first time in sector 7.
(2) They pass for the third time in sector 3.

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CEO
Joined: 20 Nov 2005
Posts: 2892

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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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14 Jul 2006, 07:51
I think its C.

St1: Two possibilities: 1. Speed of A = 7x, Speed of B = x. 2.Speed of A = 3x, Speed of B = 2x --INSUFF

St2: Same way there are multiple possibilities - : INSUFF

Combined: I did not calculate but I feel that one possibility out of 2, described in st1, will work.
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Kudos [?]: 334 [0], given: 0

14 Jul 2006, 07:51
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