A steamer going upstream would cover the distance between town A and town B in 4 hours and 30 minutes. If the same steamer going downstream would cover the distance between the towns in 3 hours, how long would it take a raft moving at the speed of the current to float from town B to town A?
(A) 10 hours
(B) 12 hours
(C) 15 hours
(D) 18 hours
(E) 20 hours
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Environmentalist: The use of snowmobiles in the vast park north of Milville creates unacceptable levels of air pollution and should be banned.
Milville business spokesperson: Snowmobiling brings many out-of-towners to Milville in winter months, to the great financial benefit of many local residents. So, economics dictate that we put up with the pollution.
Environmentalist: I disagree: A great many cross-country skiers are now kept from visiting Milville by the noise and pollution that snowmobiles generate.
Environmentalist responds to the business spokesperson by doing which of the following?
(A) Challenging an assumption that certain desirable outcome can derive from only one set of circumstances
(B) Challenging an assumption that certain desirable outcome is outweighed by negative aspects associated with producing that outcome
(C) Maintaining that the benefit that the spokesperson desires could be achieved in greater degree by a different means
(D) Claiming that the spokesperson is deliberately misrepresenting the environmentalist
(E) Denying that an effect that the spokesperson presents as having benefited a certain group of people actually benefited those people
Answers to the questions: D
For explanations please see these threads: math
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