Question: Due to some technical problem, only four pipes P1, P2, P3 and P4 are in working condition. These pipes are now paired up to obtain

Due to some technical problem, only four pipes P1, P2, P3 and P4 are in working condition. These pipes are now paired up to obtain two pairs of pipes. Now it is found that one pair of pipe is taking 2/3rd of the time taken by the other pair to fill the tank independently. Which of the following is one of the two pairs?

(a) P1, P2

(b) P1, P3

(c) P1, P4

(d) Cannot be determined..15. A can do a piece of work in 14 days which B can do in 21 days. They begin together but 3 days before the completion of the work, A leaves off. The total number of days to complete the work is:

(a) 63

(b) 8½

(c) 10.2

(d) 13.5

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