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Updated on: 28 Aug 2025, 12:43
A metropolitan transit authority is considering two plans (Plans A and B) for a new public transportation route. Both plans would provide the same passenger capacity annually. Plan A would use two subway trains, while Plan B would use five buses.
Subway trains consume less fuel per passenger transported but generate construction debris that is costly to dispose of. Buses create no such debris.
In terms of emissions, trains release about twice as much nitrogen exhaust and more than twice as much particulate matter per passenger as buses.
Finally, the two vehicle types differ in noise: each subway train is louder than each bus.
Subway trains consume less fuel per passenger transported but generate construction debris that is costly to dispose of. Buses create no such debris.
In terms of emissions, trains release about twice as much nitrogen exhaust and more than twice as much particulate matter per passenger as buses.
Finally, the two vehicle types differ in noise: each subway train is louder than each bus.
Reducing fuel consumption per passenger: Yes
Avoiding the disposal of construction debris: No
Minimizing nitrogen exhaust per passenger: No
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
77% (02:03) correct
23%
(02:17)
wrong
based on 209
sessions
History
Date
Time
Result
Not Attempted Yet
If the transit authority were to prefer Plan A (subway trains) over Plan B (buses), for each of the following reasons, select Yes if the information in the tabs supports it as a possible justification. Otherwise, select No.
| Yes | No | |
| Reducing fuel consumption per passenger | ||
| Avoiding the disposal of construction debris | ||
| Minimizing nitrogen exhaust per passenger |
ShowHide Answer
Official Answer
Reducing fuel consumption per passenger: Yes
Avoiding the disposal of construction debris: No
Minimizing nitrogen exhaust per passenger: No
2:1
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
54% (01:20) correct
46%
(01:24)
wrong
based on 237
sessions
History
Date
Time
Result
Not Attempted Yet
The ratio of the Noise Exposure Index for Plan B (buses) to that for Plan A (subway trains) is approximately
| 1:2 | |
| 5:6 | |
| 6:5 | |
| 3:2 | |
| 2:1 |
The Pollution Index for Plan A is more than twice that for Plan B.: Yes
The Health Cost Index for Plan B is less than half that for Plan A.: Yes
The Overall Index for Plan A is more than double that for Plan B.: Yes
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
66% (02:14) correct
34%
(02:31)
wrong
based on 190
sessions
History
Date
Time
Result
Not Attempted Yet
For each of the following statements, select Yes if it is supported by the information in the tabs. Otherwise, select No.
| Yes | No | |
| The Pollution Index for Plan A is more than twice that for Plan B. | ||
| The Health Cost Index for Plan B is less than half that for Plan A. | ||
| The Overall Index for Plan A is more than double that for Plan B. |
ShowHide Answer
Official Answer
The Pollution Index for Plan A is more than twice that for Plan B.: Yes
The Health Cost Index for Plan B is less than half that for Plan A.: Yes
The Overall Index for Plan A is more than double that for Plan B.: Yes
Solution to Question 1
• Reducing fuel consumption per passenger:Yes.
• Avoiding the disposal of construction debris:No.
• Minimizing nitrogen exhaust per passenger:No.
I29-189
• Reducing fuel consumption per passenger:Yes.
- Tab 1: subway trains consume less fuel per passenger transported compared with buses.
- This supports a preference for Plan A.
• Avoiding the disposal of construction debris:No.
- Tab 1: trains generate costly construction debris, whereas buses do not.
- Choosing Plan A does not avoid debris.
• Minimizing nitrogen exhaust per passenger:No.
- Tab 3: trains emit 12 g/passenger, buses emit 6 g/passenger.
- Trains produce twice as much nitrogen exhaust, so Plan A would not help minimize it.
I29-189
Solution to Question 2
Noise Exposure Index = (average noise per vehicle) × (number of vehicles in the plan).
• Plan A (2 trains): 90 × 2 = 180
• Plan B (5 buses): 75 × 5 = 375
• Ratio = 375/180 = 2.08... ≈ 2
I29-192
Noise Exposure Index = (average noise per vehicle) × (number of vehicles in the plan).
• Plan A (2 trains): 90 × 2 = 180
• Plan B (5 buses): 75 × 5 = 375
• Ratio = 375/180 = 2.08... ≈ 2
I29-192
