hard · GMAT Quant
In an industrial facility, three conveyor belts are inspected on repeating schedules: Belt 1 every 3 hours, Belt 2 every 5 hours, and Belt 3 every 6 hours. All three belts were inspected at Hour 0. During the next 180 hours (Hours 1 through 180, inclusive), at
How many hour marks will exactly two belts undergo inspection?
- 18
- 24
- 30
- 36
- 42
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