Multiple Choice Questions

A can write 75pages in 25hrs A and B together can write 135pages in 27hrs In what time can B wr...........

Quantitative Aptitude and Numerical Ability (DRDO) (Phase-i and II) Time and work

A can write 75pages in 25hrs. A and B together can write 135pages in 27hrs. In what time can B write 42pages?

Solution:
A can write 75/25 =3pages in 1hr
A+B can 135/27 = 5pages in 1hr
B can write 5-3 = 2page in 1hr
42/2 =21hrs

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