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09 Jun 2018, 11:34
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C
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:
78% (02:04) correct
22%
(02:07)
wrong
based on 199
sessions
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Pipes X and Y are inlet pipes attached to a tank, and these pipes fill the tank at their own respective individual constant speeds. When the tank was empty, pipe X was opened at 10 am and kept open until it filled the tank to its 40% capacity. After that, immediately pipe X was closed and simultaneously pipe Y was opened and kept open until the tank was filled completely. If these are the only two pipes attached to the tank, what percentage of the tank was filled by 2 pm on the same day?
(1) Pipe X was closed at 12 noon.
(2) Pipe X and pipe Y, if opened together, can fill 30% of the tank in 1 hour.
(1) Pipe X was closed at 12 noon.
(2) Pipe X and pipe Y, if opened together, can fill 30% of the tank in 1 hour.
09 Jun 2018, 21:46
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According to me, answer should be C.
From the question stem we know only what percentage has been filled by pipe X and how much is left to be filled by pipe Y.
Statement 1 says that pipe X was closed at 12 noon. Thus, we can determine the rate at which pipe X fills the tank. Still, since we have no clue as to what is the rate of pipe Y, determining the percentage of tank filled till 2 pm is not possible.
Hence, insufficient.
Statement 2, gives us the combined rate. But again neither do we know the rate of X from the question stem nor that of Y. So again, insufficient.
Combining the two statements, gives us the rate of X from statement 1 and combined rate from statement 2. So, we can find the independent rate of Y. Thus, we can determine the percentage of tank filled till 2 pm.
Hence, imo C.
Posted from my mobile device
From the question stem we know only what percentage has been filled by pipe X and how much is left to be filled by pipe Y.
Statement 1 says that pipe X was closed at 12 noon. Thus, we can determine the rate at which pipe X fills the tank. Still, since we have no clue as to what is the rate of pipe Y, determining the percentage of tank filled till 2 pm is not possible.
Hence, insufficient.
Statement 2, gives us the combined rate. But again neither do we know the rate of X from the question stem nor that of Y. So again, insufficient.
Combining the two statements, gives us the rate of X from statement 1 and combined rate from statement 2. So, we can find the independent rate of Y. Thus, we can determine the percentage of tank filled till 2 pm.
Hence, imo C.
Posted from my mobile device
