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Jonathan can type a 20 page document in 40 minutes, Susan [#permalink]

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12 Oct 2009, 12:42

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82% (02:26) correct
18% (02:04) wrong based on 162 sessions

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Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

A. 5 minutes B. 10 minutes C. 15 minutes D. 18 minutes E. 20 minutes

30. Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

A. 5 minutes B. 10 minutes C. 15 minutes D. 18 minutes E. 20 minutes

J=20/40=1/2per min S=20/30=2/3per min JK=20/24=5/6per min

30. Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

A. 5 minutes B. 10 minutes C. 15 minutes D. 18 minutes E. 20 minutes

J=20/40=1/2per min S=20/30=2/3per min JK=20/24=5/6per min

In one min together 1/2+2/3+5/6=12/6=2 pages.

For 20 pages=20/2=10

B.

If the work involved here is to type the 20page document we can even avoid calculating time taken per page. will this apporach backfire?

Re: Jonathan can type a 20 page document in 40 minutes, Susan [#permalink]

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21 Oct 2013, 06:44

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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