Maths-
SAT
Easy

Question

During a storm, the atmospheric pressure in a certain location fell at a constant rate  of 3.4 millibars (mb) per hour over a 24-hour time period. Which of the  following is closest to the total drop in atmospheric pressure, in millimeters of mercury (mm Hg), over the course of 5 hours during the 24-hour time period? (Note: 1,013 mb = 760 mm Hg)

  1. 2.6
  2. 12.8
  3. 17.0
  4. 22.7

The correct answer is: 12.8


    Its falling at a constant rate during the period, then we can conclude that = fraction numerator 3.4 mb divided by hr over denominator 5 hr end fraction equals 17 mb
    Converting mb to mm hg
    fraction numerator 17 m b over denominator 1013 m b end fraction equals fraction numerator x m m h g over denominator 760 m m h g end fraction
    0.01678 mb equals fraction numerator x mmhg over denominator 760 mmhg end fraction
    x = 12.754 = 12.8.

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