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# Plane X is flying at an altitude of 25000 sq. feet and Plane

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Plane X is flying at an altitude of 25000 sq. feet and Plane [#permalink]

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16 Aug 2003, 02:10
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Plane X is flying at an altitude of 25000 sq. feet and Plane Y at altitude of 10,000 sq. feet.
If X starts to descend as Y starts to ascend, how long will they take to reach the same altitude?
# X descends 9 times faster than Y.
# Y descends at 80 sq. feet/sec and Y at 720 sq. feet/sec.
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16 Aug 2003, 02:39
how can a plane travel at an altitude of 25000 sq. feet? An atitude is measured in feet, not square feet!

I assume that # is a set of data.

#1 is not sufficient
#2 is self contradicting, but can be sufficient, assuming that it should read -- X descends at 720 feet/sec and Y ascends at 90 feet/sec.

Looks like B. But the question is very poorly written.
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18 Aug 2003, 14:34
B, but the measurements are expressed in incorrect units.
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19 Aug 2003, 03:42
If we start to play a "what, if" game we can assume that #1 reads as "X descends 9 times faster than Y ascends" and the answer would be (D), because #1 is also sufficient
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19 Aug 2003, 06:36
bono wrote:
If we start to play a "what, if" game we can assume that #1 reads as "X descends 9 times faster than Y ascends" and the answer would be (D), because #1 is also sufficient

#1 is NOT sufficient. If Y scales up by a factor of 2, so does X and they APPROACH each other quicker.
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19 Aug 2003, 06:39
bono wrote:
If we start to play a "what, if" game we can assume that #1 reads as "X descends 9 times faster than Y ascends" and the answer would be (D), because #1 is also sufficient

You are mistaken.

With the information "X descends 9 times faster than Y ascends", you cannot know how long it will take them to meet. What if X descends at 9000000 mph and Y ascends at 1000000 mph. Don't you think they will meet a lot quicker than if X descends at 9 mph and Y at 1 mph? I believe you misread the question stem to mean "at what altitude (or relative to one of the plane's altitudes) will they meet. That question can be answered, because the speed does not matter, only the relative speed.

Do you understand? If not ask for more help.
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