Two pipes a and b can separately fill a cistern in 40 minutes and 30 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 20 minutes. In how much time, the third pipe alone can empty the cistern?
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Answered by
0
Answer:
10 minutes
Step-by-step explanation:
a cistern fill in 40 minutes so
third pipe -20
Answered by
0
Answer:
your answer is 20hr
I gave you some hint from this photo
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