Multiple choice

Directions: 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 the morning and afternoon When temp. falls below 30 degrees Fahrenheit afternoon service is cancelled in either the A line or the 3 line, but not both. When the temperature rises over 90 degrees Fahrenheit, the afternoon service is cancelled in either the line C or the 3 line but not both. When the service on the A line is delayed or cancelled, service on the C line which connects the A line, is delayed. When service on the 3 line is cancelled, service on the B line which connects the 3 line is delayed On which of the following occasions would service be on the greatest number of lines disrupted.

  1. A snowy afternoon with the temperature at 45 degree farenheit

  2. A snowy morning with the temperature at 45 degree farenheit

  3. A rainy afternoon with the temperature at 45 degree farenheit

  4. A rainy afternoon with the temperature at 95 degree farenheit
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A snowy morning at 45°F causes delays on: B (snow morning rule), A, 2, 3 (rain/snow rule). Since A is delayed, C is also delayed (connection rule). This affects 5 lines total. A rainy afternoon at 95°F would affect fewer lines, and options with 45°F afternoon don't trigger the maximum cascade of effects.

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