Three taps A,B and C can fill a cistern in 10, 15 and 20 minutes respectively. They are all turned on at once, but after 3 minutes C is turned off. How many minutes longer will A and B take to fill the cistern ?

Three taps A,B and C can fill a cistern in 10, 15 and 20 minutes respe

1.	Three taps A,B and C can fill a cistern in 10, 15 and 20 minutes respectively. They are all turned on at once, but after 3 minutes C is turned off. How many minutes longer will A and B take to fill the cistern ?
A.	2 min.
B.	2 min. 6 sec.
C.	1 min. 6 sec.
D.	3 min. 8 sec.
Answer» C. 1 min. 6 sec.

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