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24 Oct 2017, 23:53
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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:
5%
(low)
Question Stats:
88% (00:45) correct
12%
(00:51)
wrong
based on 132
sessions
History
Date
Time
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Not Attempted Yet
Two different holes, hole A and hole B, are put in the bottom of a full water tank. If the water drains out through the holes, how long will it be before the tank is empty?
(1) If only hole A is put in the bottom, the tank will be empty in 24 minutes.
(2) If only hole B is put in the bottom, the tank will be empty in 42 minutes.
(1) If only hole A is put in the bottom, the tank will be empty in 24 minutes.
(2) If only hole B is put in the bottom, the tank will be empty in 42 minutes.
25 Oct 2017, 00:03
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Option C
From st1 we don’t have the rate of B
From st2 we don’t have the rate of A
Combining we can answer as 168/13 minutes. Hence C
Posted from my mobile device
From st1 we don’t have the rate of B
From st2 we don’t have the rate of A
Combining we can answer as 168/13 minutes. Hence C
Posted from my mobile device
31 Oct 2017, 12:38
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Bunuel
St 1, only gives us information on one of the holes.
St 2, only gives us information on one of the holes.
1+2, we now can calculate the combined rate since we have the rate of each hole. C
