A writes 75 pages in 25 hours A and B write together 135 pages in 27 hours Time is taken by B to wri...........

Quantitative Aptitude (CDS) Time & distance

A writes 75 pages in 25 hours. A and B write together 135 pages in 27 hours. Time is taken by B to write 42 pages?

A writes 75 pages in 25 hours

In one hour =75/25 =3 pages

A and B writes 135

pages in 27 hours

Let B writes p pages in one hour

27(3 +p) =135

81+27p=135

27p=54

P=2

B writes 2 pages in one hour

42 pages =42/2

=21 hours

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can copy 75 pages in 25 hours. a and b together can copy 135 pages in 27 hours. in what time can b copy 42 pages?