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1. |
Pipes A and B can fill a cistern in 15 hours together. But ifthese pipes operate separately A takes 40 hours less than Bto fill the tank. In how many hours the pipe A will fill thecistern working alone? |
A. | 60 |
B. | 20 |
C. | 40 |
D. | 15 |
Answer» C. 40 | |