hard · GMAT Quant
Three assembly units, A, B, and C, run on periodic maintenance cycles. Unit A operates for 3 consecutive hours and pauses for 1 hour. Unit B operates for 4 consecutive hours and pauses for 1 hour. Unit C operates for 5 consecutive hours and pauses for 1 hour. If all three units start operating at Hour 0, during the first 60-hour operational block (Hours 0 to 60)
How many hours are ALL THREE units operating simultaneously?
- 23
- 28
- 30
- 32
- 35
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