hard · GMAT Quant
An industrial pump A fills a reservoir at 400 gallons per hour. After 3 hours, a second pump B is activated, filling the same reservoir at 600 gallons per hour.
When the reservoir is half full, pump A is deactivated. If the reservoir's total capacity is 6,000 gallons, how many hours in total does pump B run?
- 4.8
- 1.8
- 3.0
- 6.8
- 5.0
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