- A12
- B18
- C10
- D15
Step-by-Step Solution
In 6 minutes both fill 6/20 + 6/30 = 0.3 + 0.2 = 0.5 of the tank; B fills the remaining 0.5 at 1/30 per minute, taking 15 minutes.
Answer: D) 15
Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. Both are opened together, but pipe A is closed after 6 minutes. How much longer will pipe B take to fill the remaining tank (in minutes)?
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