Solve.One conveyor belt can move 1000 boxes in 10 minutes. Another can move 1000 boxes in 6 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. 
minutes
B. 1
minutes
C. 15 minutes
D. 
minutes
Answer: C
Mathematics
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?
?
A. ?
B. ?
C. ?
D. ?
E. ?
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