A machine 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

Question

14-04-2015
Mathematics

Answered

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A machine 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

Sagot :

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