medium · GMAT Quant
Heater A operates for 3 minutes every 7-minute cycle. Heater B operates for 2 minutes every 4-minute cycle. Both turn on at t = 0. For
How many total minutes during the first 56 minutes is exactly one heater operating?
- 28 minutes
- 40 minutes
- 20 minutes
- 32 minutes
- 12 minutes
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