How long will it take for two pipes A and B to fill an empty cistern i – McqOptions

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1.	How long will it take for two pipes A and B to fill an empty cistern if they worked alternately for an hour each ? A. Working alone, Pipe A can fill the cistern in 40 hoursB. Pipe B is one third as efficient as Pipe A
A.	Only A is sufficient
B.	Only B is sufficient
C.	Both (A) and (B) are sufficient
D.	and (B) are sufficient D)
Answer» D. and (B) are sufficient D)

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