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1. The pipe can independently fill a water tank in 10,12 and 15 hours. How many hours will take for all three pipes opened together to fill half of the tanks?
- A. 6
- B. 6
- C. 6
- D. 6
Answer: Option D
Explanation:
In 1 hour 3 pipes can fill = 1/10 + 1/12 + 1/15
= ( 6 + 5 + 4) /60 = 15/60 = 1/4
1/4 portion can fill 1 hour
1/2 portion can fill 4/2 hour = 2 hour
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