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SSC CGL Tier 2 Exam 25 Oct 2015 Paper 1
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Question : 16
Total: 100
Pipe A can fill an empty tank in 6 hours and pipe B in 8 hours. If both the pipes are opened and after 2 hours pipe. A is closed, how much time B will take to fill the remaining tank?
7
1
2
hours
2
2
5
hours
2
1
3
hours
3
1
3
hours
Validate
Solution:
(4) Part of tank filled by pipes A and B in 2 hours
=
2
(
1
6
+
1
8
)
=
2
(
4
+
3
24
)
=
7
12
Remaining part
=
1
−
7
12
=
5
12
This part is filled by pipe B.
∴
Required time
=
5
12
×
8
=
10
3
hours
=
3
1
3
hours
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