PrepTest 136

Incorrect. It's possible that the airport "shuts down" half of the runways, allowing the same number of planes to land on half of them and none to land on the other half, so this answer isn't supported.

Incorrect. While the argument does establish that planes are landing on adjacent runways at some point in good weather, it's not supportable that there's a 51+% chance that that's happening at any given time. That could only happen 40% of the time, but that's enough to allow for the double rate of landings.

Incorrect. Two issues here. First, this answer is about planes landing on any two runways, not adjacent ones. Second, the stimulus notes that delays result when planes can't land on adjacent runways simultaneously. This answer has a term shift and is contradicted.

Correct. Argument or Facts:
Facts

Question Type:
Must Be True

Stimulus Summary:
An airport allows 60 planes/hour in good weather and 30 planes/hour when visibility is poor/weather is bad. Airlines assume good weather, so bad weather leads to delays.

Answer Anticipation:
There are a couple points of overlap between the statements here, and they both deal with weather.

The stimulus notes that the airport allows 60 planes/hour to land in good weather, and airlines assume good weather, so we can infer that airlines assume 60 planes/hour can land at the specific airport when they're planning their schedules.

The stimulus also notes that the airport allows 30 planes/hour when weather is bad, and bad weather leads to delays, so we can infer that if the airport only allows 30 planes/hour to land, that'll lead to delays.

Answer Explanation:
This answer brings the statements together. The airport allows only 30 planes to land per hour in poor weather. Airlines assume good weather, when the airport allows 60 planes to land per hour. Therefore, the airlines using this airport must base their schedules on the assumption that 60 planes/hour will be allowed to land—which is more than 30.

Key Takeaway:
Statements that share terms will frequently lead to inferences—just as rules that share a term frequently lead to inferences in LG.

Incorrect. The stimulus notes that bad weather creates serious delays, but it doesn't state that good weather prevents those delays—there could be other causes of delays that happen during good weather. This answer is a bit of a negation from the stimulus.