Two pipes can separately fill a cistern in 20 min and 30 min respectively. When the
waste pipe is open, the two pipes can together fill the cistern in 1 h. Find the time
taken by the waste pipe to empty a full cistern.
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Step-by-step explanation:
Total capacity. 60
eff unit min 20 30
min a. b
a+b capasity of filling for 1 min
3+2= 5 units /min
a+b can fill the full tank in
total capacity =60
effeciancy a and b =5
=12 min
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