A copy machine, working at a constant rate, makes 25 copies per minute.

A copy machine, working at a constant rate, makes 25 copies per minute. A second copy machine, working at a constant rate, makes 55 copies per minute. Working together at their respective rates, how many copies do the two machines make in half an hour ?

Quiz

Answer/Solution

2,400

Steps/Work

Together the two machines make 25+55=80 copies per minute. So, in half an hour they will make 80*30=2,400 copies.
Answer: B.

Physics Calculator / Auto Solver

A copy machine, working at a constant rate, makes copies per minute. A second copy machine, working at a constant rate, makes copies per minute. Working together at their respective rates, how many copies do the two machines make in half an hour?

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