Question

Four pipes A, B,C and D can fill a cistern in 20, 25, 40 and 50 hours respectively. If A and B are opened as inle as outlet pipes from the cistern and all the four pipes are opened simultaneously, how many hours will take to fill the cistern c

• A. 20 hrs
• B. 11 1/9 hrs
• C. 22 2/9 hrs
• D. 45 hrs

Answer 1

The Correct Option is C

The correct option is (C):22 2/9 hrs