[GMAT math practice question]
A river flows with a constant speed of 2 miles per hour. It takes 3 hours for a ship to go 6 miles upstream. How many hours does it take the ship to travel the same distance downstream?
A. 1/4
B. 1/3
C. 1/2
D. 1
E. 3/4
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A river flows with a constant speed of 2 miles per hour. It
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Max@Math Revolution
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Assume v is the speed of the ship.
Then 6 / ( v - 2 ) = 3 and 2 = v - 2. Thus, v = 4.
The number of hours it takes for the ship to go 6 miles downstream, is 6 / ( v + 2 ) = 6 / ( 4 + 2 ) = 1.
Therefore, D is the answer.
Answer: D
Assume v is the speed of the ship.
Then 6 / ( v - 2 ) = 3 and 2 = v - 2. Thus, v = 4.
The number of hours it takes for the ship to go 6 miles downstream, is 6 / ( v + 2 ) = 6 / ( 4 + 2 ) = 1.
Therefore, D is the answer.
Answer: D
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