Task: Question Answering
Input (English): Question: Machine R and machine B are each used to manufacture 660 sprockets. It takes machine R 10 hours longer to produce 660 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine R. How many sprockets per hour does machine R produces?

 Option A: 6

 Option B: 6.6

 Option C: 60

 Option D: 100

 Option E: 110
Output (English): Option A