A) 3 hrs. 20 min
B) 3 hrs. 45 min
C) 4 hrs. 15 min
D) 4 hrs. 30 min.
Correct Answer: B
Solution :
[b] Pipe A has 1H work\[=\frac{1}{6}\] Pipe A has 3H work\[=\frac{1}{2}\] 4 pipes fill in 1 H \[=\frac{1}{6}+\frac{1}{6}+\frac{1}{6}+\frac{1}{6}=\frac{2}{3}\] part \[\frac{1}{2}\] Part they fill in \[=\frac{3}{4}\,\min =45\,\min \] Total time = 3H 45 min
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