Mathematics, 30.08.2019 17:30, matthew6889
Amachine can insert letters in envelopes at the rate of 120 per minute. another machine can stamp the envelopes at the rate of 3 per second. how many such stamping machines are needed to keep up with 18 inserting machines of this kind?
(a) 12
(b) 16
(c) 20
(d) 22
(e) 24
Answers: 1
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Amachine can insert letters in envelopes at the rate of 120 per minute. another machine can stamp th...
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