easy · GMAT Quant
A manufacturing plant operates two production lines, Line A and Line B. Line A produces 15 units per hour, and Line B produces 22 units per hour. During a single day, the two lines operated for a combined total of 18 hours and produced 312 units.
How many hours did Line A operate during that day?
- 12
- 6
- 18
- 15
- 9
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