# Two pipes A and B can ﬁll an empty tank in 12 hours and 18 hours respe

| Two pipes A and B can ﬁll an empty tank in 12 hours and 18 hours respectively. Pipe C alone can empty the completely ﬁlled tank in 15 hours. First both pipes A and B are opened and after 5 hours pipe C is also opened. What is the total time (in hours) in which the tank will be ﬁlled?

A. hr

B. 5hr

C. 9hr

D. 8

### Right Answer is: A

#### SOLUTION

(A + B) for 5 hr = 25 × 5

= 125 unit

Remain = 55 unit

A + B – C= 13/hr

Total time in which tank will be filled

= 4hr

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Two pipes A and B can ﬁll an empty tank in 12 hours and 18 hours respe