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IBPS Clerk Prelims Model Paper 14
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© examsnet.com
Question : 38
Total: 100
Two pipes can fill a cistern separately in 24 min and 40 min respectively. Waste pipe is opened which can drain the cistern at 30 liters/minute. If all the pipe are opened together then the cistern fills in one hour. The capacity (in litre) of the cistern is?
800
400
600
500
None of these
Validate
Solution:
Let waste pipe can drain the cistern in x minute.
Then,
1
24
+
/
40
−
1
x
=
1
60
1
x
=
1
24
+
1
40
−
1
60
1
x
=
5
+
3
−
2
120
1
x
=
6
120
=
1
20
x = 20 min
Wast pipe cand drain of 20L/ min. (given)
Hence, capacity of the cistern = 30 × 20 = 600 L
© examsnet.com
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