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Two typists P and Q work individually for 6 hours a day. What is the d

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GMAT 1: 660 Q46 V35
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Two typists P and Q work individually for 6 hours a day. What is the d  [#permalink]

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New post 07 Aug 2017, 06:16
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  75% (hard)

Question Stats:

59% (01:22) correct 41% (01:46) wrong based on 96 sessions

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Two typists P and Q work individually for 6 hours a day. What is the difference between the average number of pages typed per hour by person P on a single day and the average number of pages typed per hour by person Q on the single day?

(1) The typing speed of the person P is constant and is 10 pages per hour, whereas the typing speed of person Q is 19 pages per hour for initial three hours on the same day.

(2) Twice the average number of pages typed by person Q in one hour is 3.8 times the average number of pages typed by person P in one hour.
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Re: Two typists P and Q work individually for 6 hours a day. What is the d  [#permalink]

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New post 07 Aug 2017, 07:50
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DH99 wrote:
Two typists P and Q work individually for 6 hours a day. What is the difference between the average number of pages typed per hour by person P on a single day and the average number of pages typed per hour by person Q on the single day?

(1) The typing speed of the person P is constant and is 10 pages per hour, whereas the typing speed of person Q is 19 pages per hour for initial three hours on the same day.

(2) Twice the average number of pages typed by person Q in one hour is 3.8 times the average number of pages typed by person P in one hour.


(1) Average of P (Pavg) is 10 but cannot deduce average of Q(Qavg) and hence the difference between the averages... Not sufficient

(2) 2 * Qavg = 3.8 * Pavg ..We do not know the value of Qavg ...Not sufficient

However when we combine
we can get the Qavg = (3.8 * 10)/2 = 19 and hence the difference between both the averages (19-10 = 9)
Sufficient
C
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Re: Two typists P and Q work individually for 6 hours a day. What is the d &nbs [#permalink] 07 Aug 2017, 07:50
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