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22 Jul 2010, 22:12
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B
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:
87% (01:35) correct
13%
(01:21)
wrong
based on 98
sessions
History
Date
Time
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If it takes a tub 3 minutes to drain 5/7 of its content, how much more time will it take for the tub to be empty?
A. 48 seconds
B. 1 minute, 12 seconds
C. 1 minute, 50 seconds
D. 2 minutes, 14 seconds
E. 4 minutes, 12 seconds
A. 48 seconds
B. 1 minute, 12 seconds
C. 1 minute, 50 seconds
D. 2 minutes, 14 seconds
E. 4 minutes, 12 seconds
22 Jul 2010, 23:31
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If 5/7 of tub's content is drained 2/7 th of tub still needs to be drained.
If it takes 3 minutes to drain 5/7 th of tub it takes 3*(7/5) minutes to drain the entire tub and 3*(7/5)*(2/7) min to drain 2/7 th of the tub which is 6/5 minutes or 1 1/5 minutes or 1 minute 12 seconds
So answer is B
If it takes 3 minutes to drain 5/7 th of tub it takes 3*(7/5) minutes to drain the entire tub and 3*(7/5)*(2/7) min to drain 2/7 th of the tub which is 6/5 minutes or 1 1/5 minutes or 1 minute 12 seconds
So answer is B
26 May 2017, 15:18
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RTW chart is ideal for such problems.
We have W = 5/7
we have T=3.
rate is 5/21
we are left with 2/7
we need to empty this with a rate of 5/21
we will do this in 2/7 * 21/5 = 6/5 or 1 minute 12 seconds.
B is the answer.
We have W = 5/7
we have T=3.
rate is 5/21
we are left with 2/7
we need to empty this with a rate of 5/21
we will do this in 2/7 * 21/5 = 6/5 or 1 minute 12 seconds.
B is the answer.
