Q: Pipe A and B can empty a full tank in 20 and 15 hours respectively wherever C can full the tank alone in x hours. Three pipes are open together at the same time and to empty (1/18)th part of the tank it taken 40 min. What is the value of x.
A.
21 hours
B.
30 hours
C.
26 hours
D.
24 hours
Correct Answer:
Option B -
Explanations:
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