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# When the wind speed is 9 miles per hour, the wind-chill

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Manager
Joined: 06 Nov 2008
Posts: 53

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When the wind speed is 9 miles per hour, the wind-chill [#permalink]

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09 Nov 2008, 07:45
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

When the wind speed is 9 miles per hour, the wind-chill factor w is given by w = -17.366 + 1.19t, where t is the temperature in degrees Fahrenheit. If at noon yesterday the wind speed was 9 miles per hour, was the wind-chill factor greater than 0 ?
(1) The temperature at noon yesterday was greater than 10 degrees Fahrenheit.
(2) The temperature at noon yesterday was less than 20 degrees Fahrenheit.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

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Intern
Joined: 30 Oct 2008
Posts: 30

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09 Nov 2008, 07:50
E.

When t=11, w is negative. When t=19, w is positive.
So the given statements are not sufficient to conclude the sign of w.

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Re: wind speed---29   [#permalink] 09 Nov 2008, 07:50
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