hard · GMAT Quant
An automated farm uses three irrigation pumps, I_1, I_2, and I_3, operating on repeating cycles of 6 hours, 8 hours, and 12 hours, respectively. Pump I_1 is active during hour 1 of its 6-hour cycle, I_2 is active during hour 1 of its 8-hour cycle, and I_3 is active during hour 1 of its 12-hour cycle. During a 120-hour operation window starting at hour 1, during
How many hours are exactly two irrigation pumps active simultaneously?
- 20
- 10
- 5
- 6
- 0
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