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After completing a speed training, Alyosha translates Russia

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GMAT Club Legend
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Joined: 07 Jun 2014
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GRE 1: Q167 V156
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After completing a speed training, Alyosha translates Russia [#permalink] New post 18 Jun 2018, 15:00
Expert's post
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Question Stats:

75% (01:06) correct 25% (00:30) wrong based on 12 sessions
After completing a speed training, Alyosha translates Russian literature into English at a rate of 10 more than twice as many words per hour as he was able to translate before the training. If he was previously able to translate 10 words per minute, how many words can he now translate in an hour?

(A) 30
(B) 70
(C) 610
(D) 1,210
(E) 1,800
[Reveal] Spoiler: OA

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Re: After completing a speed training, Alyosha translates Russia [#permalink] New post 23 Jun 2018, 10:43
sandy wrote:
After completing a speed training, Alyosha translates Russian literature into English at a rate of 10 more than twice as many words per hour as he was able to translate before the training. If he was previously able to translate 10 words per minute, how many words can he now translate in an hour?

(A) 30
(B) 70
(C) 610
(D) 1,210
(E) 1,800


Now we have,
New rate = 2*Old rate + 10

Old rate = 10 words/min = 600 words/hr

Therefore New rate= (2*600)+10 = 1210
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Re: After completing a speed training, Alyosha translates Russia [#permalink] New post 24 Jun 2018, 17:01
Expert's post
sandy wrote:
After completing a speed training, Alyosha translates Russian literature into English at a rate of 10 more than twice as many words per hour as he was able to translate before the training. If he was previously able to translate 10 words per minute, how many words can he now translate in an hour?

(A) 30
(B) 70
(C) 610
(D) 1,210
(E) 1,800


Originally, he could translate 10 words per minute, which is 60 x 10 = 600 words translated per hour.

After the training, he can now translate 2 x 600 + 10 = 1,210 words per hour.

Answer: D
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Re: After completing a speed training, Alyosha translates Russia [#permalink] New post 25 Jun 2018, 07:32
Old rate = 10 words/min = 600 words/hour
New rate = twicw the Old rate + 10
New rate = (2 * 600) + 10 = 1210
GMAT Club Legend
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WE: Business Development (Energy and Utilities)
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Kudos [?]: 1659 [0], given: 396

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Re: After completing a speed training, Alyosha translates Russia [#permalink] New post 10 Jul 2018, 05:39
Expert's post
Explanation

To find the new rate in words per hour, start by setting up an equation to find this value:

New words per hour = 10 + 2(Old words per hour)

The old rate was given in words per minute, so convert to words per hour:

10 words per min × 60 min per hour = 600 words per hour

Now plug into the equation:
New words per hour = 10 + 2(600) = 1,210

Note that it would be dangerous to start by working with the rate per minute. If you did so, you might calculate 10 + 2(10) = 30 words per minute, then 30 × 60 = 1,800 words per hour. This rate is inflated because you added an additional 10 words per minute instead of per hour. Perform the conversions right away!
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Re: After completing a speed training, Alyosha translates Russia   [#permalink] 10 Jul 2018, 05:39
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After completing a speed training, Alyosha translates Russia

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