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Q: Four pipes P, Q, R and S can fill a cistern in 25, 20, 50 and 40 hours respectively. The pipe Q was opened at 7 pm, P at 9 pm, S at 10 pm and R at 11 pm. When will the cistern be full?

A. 03:29:00
B. 02:47:00
C. 04:09:00
D. 05:02:00
Answer» D. 05:02:00


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