Study Room

Goto

Arithmetic Ability
Pipes and Cistern

Take Exam
Previous
17 / 30
Next

Q.

Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 3 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill  ?

View Answer

Correct choice: C

Explanation:

1/10 + 1/15 = 1/6 x 3 = 1/2 1 - 1/2 = 1/2 1/10 + 1/15 - 1/x = 1/2 x = 8.57 min
Previous
17 / 30
Next