Multiple choice

Directions: Read the following information and answer the question that follows.

A certain city is served by subway lines A, B and C and numbers 1, 2 and 3. When it snows, morning service on B is delayed. When it rains or snows, service on A, 2 and 3 are delayed both in morning and afternoon. When temperature falls below 30°F, afternoon service is cancelled in either line A or line 3, but not both. When the temperature rises above 90°F, the afternoon service is cancelled in either line C or line 3, but not both. When the service on line A is delayed or cancelled, service on line C which connects line A, is delayed. When service on line 3 is cancelled, service on line B, which connects line 3, is delayed. On Jan 10, with the temperature at 15°F, it snows all day.

On how many lines will the service be affected, including both morning and afternoon?

  1. 2

  2. 3

  3. 4

  4. 5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

On Jan 10 with 15°F temperature and snow: Morning delays on B (due to snow) and A, 2, 3 (due to snow). Since temperature is below 30°F, afternoon service is cancelled on either A or 3. Regardless of which is cancelled, A is already delayed in afternoon, and C is delayed (because A is delayed/cancelled). Also, if 3 is cancelled, B is delayed. Counting all affected lines: A, B, C, 2, 3 = 5 lines total.

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