Question

A cistern has two pipes. one can fill it with water in 8 hours and the other can empty it in 5 hours. in how many hours will the cistern be emptied if both the pipes are opened together when of the cistern is already half full of water? select one: a. 7 hours b. 6 hours c. 6 hours 40 minutes d. none of these

Answer 1

Answer:

Step-by-step explanation:

Small mistake in your question.

Question :- A cistern has two pipes. one can fill it with water in 8 hours and the other can empty it in 5 hours. in how many hours will the cistern be emptied if both the pipes are opened together when 3/4 of the cistern is already half full of water ?

Answer :- Refer the below attachment.