Q: Three pipes, A, B, C can fill an empty cistern in 2, 3 and 6 hours respectively. They are opened together. After what time should B be closed, so that the cistern gets filled in exactly 1hr 15min?
A.
15 minutes
B.
20 minutes
C.
45 minutes
D.
30 minutes
Correct Answer:
Option D -
Explanations:
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