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# One copy machine can make 20 copies a minute, and a second copy machin

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Math Expert
Joined: 02 Sep 2009
Posts: 60482
One copy machine can make 20 copies a minute, and a second copy machin  [#permalink]

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14 Feb 2016, 03:55
00:00

Difficulty:

15% (low)

Question Stats:

82% (01:05) correct 18% (02:48) wrong based on 68 sessions

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One copy machine can make 20 copies a minute, and a second copy machine makes 15 copies a minute. If the two copiers work together, how long would it take them to make 2,100 copies?

A. 60 minutes
B. 105 minutes
C. 122.5 minutes
D. 140 minutes
E. 225 minutes

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Re: One copy machine can make 20 copies a minute, and a second copy machin  [#permalink]

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14 Feb 2016, 10:44
Total work done by both machines in a minute = 20 + 15 = 35 copies
Total number of copies required = 2100
Time = 2100/35 = 60 mins
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Re: One copy machine can make 20 copies a minute, and a second copy machin   [#permalink] 14 Feb 2016, 10:44
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