Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
A pipe normally takes 4 min to fill a bucket. Due to a hole in the bucket, it takes 5 min. In how much time will the hole empty the full bucket?
1
20 min
2
15 min
3
18 min
4
More than one of the above
5
None of the above