Problem Solving

试题详情

题目:

Working at their respective constant rates, machine A makes 100 copies in 12 minutes and machine B makes 150 copies in 10 minutes. If these machines work simultaneously at their respective rates for 30 minutes, what is the total number of copies that they will produce?

选项:

A、250
B、425
C、675
D、700
E、750

答案:

D
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