Three pipes A, B and C were opened to fill a cistern. Working alone, A, B and C require 12, 15 and 20 minutes respectively.After 4 minutes of working together, A got blocked and after another 1 minute, B also got blocked. C continued to work till the end and the cistern got completely filled. What is the total time taken to fill the cistern ?

Three pipes A, B and C were opened to fill a cistern. Working alone, A

1.	Three pipes A, B and C were opened to fill a cistern. Working alone, A, B and C require 12, 15 and 20 minutes respectively.After 4 minutes of working together, A got blocked and after another 1 minute, B also got blocked. C continued to work till the end and the cistern got completely filled. What is the total time taken to fill the cistern ?
A.	6 minutes
B.	6 minutes 15 seconds
C.	6 minutes 40 seconds
D.	6 minutes 50 seconds
Answer» D. 6 minutes 50 seconds

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