Solve the problem.One conveyor belt can move 1000 boxes in 6 minutes. Another can move 1000 boxes in 10 minutes. If another conveyor belt is added and all three are used, the boxes are moved in 3 minutes. How long would it take the third conveyor belt alone to do the same job?
A. 
minute
B. 15 minutes
C. 
minute
D. 1
minutes
Answer: B
Mathematics
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