To fill a cistern, pipes A, B and C take 20 minutes, 15 minutes and 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern, is :
A. 5
B. 12
C. 10
D. 15 and 2/3
Answer:A
To fill a cistern, pipes A, B and C take 20 minutes, 15 minutes and 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern, is :
A. 5 B. 12 C. 10 D. 15 and 2/3