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1. 3 pumps , working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day ?
- A. 10
- B. 10
- C. 10
- D. 10
Answer: Option C
Explanation:
3 pumps 2 days empties by working 8 hrs
1 " 2 " " " " ( 8 × 3) hrs
1 " 1 " " " " ( 8 × 3 × 2) hrs
4 " 1 " " " " ( 8 × 3 × 2) /4 hrs
= 12 hrs
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