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A photocopier can copy r pages per hour. How many pages can it copy in

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Bunuel
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A photocopier can copy r pages per hour. How many pages can it copy in [#permalink] New post   13 Jun 2018, 12:24
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A
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D
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74% (00:53) correct 26% (01:03) wrong based on 173 sessions
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A photocopier can copy r pages per hour. How many pages can it copy in s seconds?


A. \(\frac{rs}{60}\)

B. \(\frac{r}{60s}\)

C. \(\frac{s}{3600r}\)

D. \(\frac{rs}{3600}\)

E. \(3600rs\)
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Re: A photocopier can copy r pages per hour. How many pages can it copy in [#permalink] New post   13 Jun 2018, 13:55
D
r pages/hr * 1 hr/3600 seconds * s seconds
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Re: A photocopier can copy r pages per hour. How many pages can it copy in [#permalink] New post   13 Jun 2018, 18:23
Bunuel wrote:
A photocopier can copy r pages per hour. How many pages can it copy in s seconds?


A. \(\frac{rs}{60}\)

B. \(\frac{r}{60s}\)

C. \(\frac{s}{3600r}\)

D. \(\frac{rs}{3600}\)

E. \(3600rs\)



we know , 1 hr = 60 mins
60 mins = 60*60 s = 3600 seconds

So, In 3600 sec machine produces r copies
in 1 sec machine produces\(\frac{r}{3600}\)copies
in S sec machine produces \(\frac{rs}{3600}\) copies

Thus the best answer is D.
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Re: A photocopier can copy r pages per hour. How many pages can it copy in [#permalink] New post   13 Jun 2018, 22:07
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Solution



Given:
    • A photocopier can copy r pages per hour

To find:
    • The number of pages the photocopier can copy in s seconds

Approach and Working:
We know, 1 hour = 3600 seconds

Hence, we can write,
    • In 3600 seconds, the photocopier can copy r pages
    Or, in 1 second, the photocopier can copy = \(\frac{r}{3600}\) pages
    Therefore, in s seconds, the photocopier can copy = \(\frac{rs}{3600}\) pages

Hence, the correct answer is option D.

Answer: D
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Re: A photocopier can copy r pages per hour. How many pages can it copy in [#permalink]
13 Jun 2018, 22:07
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