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1. Water flows into an empty 64-gallon drum through pipe A and follows out through pipe B. If the rate of flow through A is 2 gallons/h, how many gallons per hour must flow out through pipe B so that the drum is full in exactly 96 hours?
- A. 2/3
- B. 2/3
- C. 2/3
- D. 2/3
Answer: Option B
Explanation:
Let the required flow rate of pipe B be X gallons per hour.
Together they fill (2 - X) gallons per hour.
ATQ, 64 / (2 - X) = 96)
Or, 64 / 96 = 2 - X
Or, X = 2 - 64 / 96 = 4/3 gallons per hour.
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