hard · GMAT Quant
A reservoir can be filled by Pump A in 4 hours and by Pump B in 6 hours. Pump A begins filling the empty reservoir alone and is joined by Pump B after 1 hour.
What is the total time, in hours, required to fill the reservoir from the start?
- 2.4
- 3.0
- 3.4
- 1.8
- 2.8
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