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IBPS RRB Office Assistant 2020 Paper
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© examsnet.com
Question : 77
Total: 80
Two taps can fill a tank in 12 min and 18 min respectively. Both are kept open for 2 min and the first is turned off. In how many minutes more will the tank be filled?
15 min
20 min
11 min
13 min
19 min
Validate
Solution:
Part filled by first tap in one min
=
1
12
th
Part filled by second tap in one min
=
1
18
th
Now,
2
(
1
12
+
1
18
)
+
unfilled part
=
1
⇒ unfilled part
=
13
18
th
∵
1
18
th
part of tank is filled by second tap in 1 min.
∴
13
18
th
part of tank is filled by second tap
=
18
×
13
18
min
=
13
min
© examsnet.com
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