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RRB Paramedical Staff Nurse Model Paper 3
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© examsnet.com
Question : 51
Total: 100
Two inlet pipes P and Q can fill a tank in 24 minutes and 32 minutes respectively. If both the pipes are opened simultaneously, after how much time should Q be closed so that the tank is full in 18 minutes ?
6 min
8 min
10 min
11 min
Validate
Solution:
1 minute work of
(
P
+
Q
)
both
=
(
1
24
+
1
32
)
=
4
+
3
8
×
12
=
7
96
minutes
i.e. tank will full in
96
7
minutes.
Let Q is closed after x minutes
∴ rest work
=
(
1
−
7
x
96
)
done by P
p → 24 minutes → 1
∴
(
1
−
7
x
96
)
→
24
(
1
−
7
x
96
)
∴
24
(
1
−
7
x
96
)
=
(
18
−
x
)
⇒
24
−
7
x
4
=
18
−
x
⇒
6
=
3
x
4
⇒
x
=
8
minutes
© examsnet.com
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