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RRB Paramedical Staff Nurse Model Paper 4
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© examsnet.com
Question : 42
Total: 100
Two pipes can fill a tank separately in 20 min and 30 min respectively. If both the pipes are opened simultaneously, then the tank will be filled in
10 min
12 min
15 min
25 min
Validate
Solution:
Part of the tank
Filled by Ist = 20 min
Filled by IInd = 30 min
Then, part of the tank filled in 1h by both the pipes
=
1
20
+
1
30
=
3
+
2
60
=
1
12
Thus, required time
=
12
min
Alternate Method
Here,
x
=
20
and
y
=
30
Time taken by both the pipes
=
x
y
x
+
y
=
20
×
30
20
+
30
=
600
50
=
12
m
i
n
© examsnet.com
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