Two pipes A and B can fill a cistern in 20 minutes and 30 minutes respectively These pipes are opene...........

Quantitative Aptitude ( CCS) Pipes&cistern

Two pipes A and B can fill a cistern in 20 minutes and 30 minutes respectively. These pipes are opened alternately for 1 minute each, beginning with pipe A. In what time will the cistern be full?

24minutes

20minutes

18minutes

28minutes

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Explanation:

Answer & Explanation
Answer – 24minutes
Explanation :
In 2 minutes the part of the cistern filled = [(1/20) + (1/30)] = (5/60) = (1/12)
:.(1/12) part of cistern is filled in 2 minutes
1 part of the cistern will be full in = (12×2) = 24 minutes