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Pipes and Cisterns Practice Test 1 with solutions
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© examsnet.com
Question : 9
Total: 40
Two pipes A and B would fill a cistern in 20 and 34 minutes respectively. Both pipes being opened, find when the first pipe must be turned off so that the cistern may be just filled in 17 minutes?
10 min.
30 min.
17 min.
34 min
Validate
Solution:
👈: Video Solution
The part of the cistern filled by B in 17 min =
1
24
×
17
=
1
2
Remaining part = 1 -
1
2
=
1
2
Time taken by A to fill the remaining part =
1
2
1
20
= 10 min.
Hence, pipe A must be turned off after 10 minutes.
© examsnet.com
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