Question

A pipe can fill a cistern in 30 minutes and a waste-pipe can empty it in 1 hour. If both pipes are opened at once when the cistern is empty, how long will it take to fill the cistern?​

Answer 1

Answer:

sorry I didn't know this question is answered by them

I don't know

Step-by-step explanation:

Okay

Answer 2

Answer:

1hrs

Step-by-step explanation:

• In 1 min pipe can fill 1/30 part
• In 1 min waste pipe can empty 1/60 part
• In both pipe are opened at once then 1/30-1/60
• 1/30-1/60=1/60
• 1/60 part can fill in 1 min
• 1 cistern can fill up in 60 min i.e 1 hrs...hope you got satisfied