- A12
- B18
- C15
- D20
Step-by-Step Solution
In 10 minutes A fills 1/2 and B fills 1/3, together 5/6. The remaining 1/6 is filled by B at 1/30 per minute in 5 minutes, so total = 10 + 5 = 15 minutes.
Answer: C) 15
Two pipes A and B can fill a tank in 20 and 30 minutes respectively. Both are opened together, but pipe A is closed after 10 minutes. What is the total time in minutes to fill the tank?
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