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x can copy 80 pages in 20 hours, x and y together can copy 135 pages in 27 hours. Then y can copy 20

pages in


A) 20 hours

B) 24 hours

C) 3 hours

D) 12 hours

Correct Answer:
A) 20 hours

Description for Correct answer:
Rx =\( \Large \frac{80}{20} \) pages/hr

=4 p/h

\( \Large R \left(x+y\right) \frac{135}{27} \) pages/hr

=5 p/h

Ry=\( \Large R \left(x+y\right) -Rx = \left(5-4\right) \)

=1 p/h

y can copy 20 pages =\( \Large \frac{20p}{1p/h} \)

=20 h

Part of solved Time and work questions and answers : >> Aptitude >> Time and work




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