easy · GMAT Quant
A manufacturing robot R1 paints car doors at a rate of 20 per hour. After R1 has been working for 4 hours, robot R2 starts painting at a rate of 30 per hour.
How many hours after R2 starts will it have painted the same number of doors as R1?
- 8
- 12
- 4
- 2.67
- 10
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