A. 2 min
B. 3 min
C. 4 min
D. 5 min
Let Q be closed after x min. Then part filled by (P+Q) in x min + part filled by P in ( 9 – x )min
x(1/12+1/16)+(9−x)1/12=1
Correct Answer: C. 4 min ✔
Last Updated: November 19, 2019
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