Pipes & Cisterns Mcqs

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 4 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill?

a. 7 min
b. 8 min
c. 9 min
d. 10 min


ANSWER: See Answer
 
1/10 + 1/15 = 1/6 * 4 = 2/3

1 – 2/3 = 1/3

1/10 + 1/15 – 1/x = 1/3

x = 8
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