To fill a cistern, pipes A, B and C take 20 minutes, 15 minute and 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is
Answer & explanation
Correct answer: option 1
The above chart was obtained after following the details of the question:
Efficiency of A = 3
Efficiency of B = 4
Efficiency of C = 5
Efficiency of A+B+C = 12
Days required by A, B and C together to complete the work: \(\frac{60 }{12 }\) = 5 days