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12 Mar 2015, 06:52
Kudos
Bookmarks
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:
92% (01:15) correct
8%
(01:40)
wrong
based on 201
sessions
History
Date
Time
Result
Not Attempted Yet
Pump X takes 28 hours to fill a pool. Pump Y takes 21 hours to fill the same pool. How long does it take them to fill the same pool if they are working simultaneously?
A. 7 hr
B. 10 hr
C. 12 hr
D. 14 hr
E. 18 hr
Kudos for a correct solution.
A. 7 hr
B. 10 hr
C. 12 hr
D. 14 hr
E. 18 hr
Kudos for a correct solution.
12 Mar 2015, 07:23
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Bookmarks
the answer is C
Pump X takes 28 hours to fill a pool, so X rates is 1/28
Pump Y takes 21 hours to fill a pool, so Y rates is 1/21
working togther=(1/21+1/28)*t=1
7/84*t=1
t=84/7 =14
Pump X takes 28 hours to fill a pool, so X rates is 1/28
Pump Y takes 21 hours to fill a pool, so Y rates is 1/21
working togther=(1/21+1/28)*t=1
7/84*t=1
t=84/7 =14
12 Mar 2015, 09:05
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23a2012
hi,
ans C..
1/21+1/28=7/84..
time taken =84/7=12...
