A can write 75 pages in 25 hours. A and B together can write 135 pages in 27 hours. In what time can B write 42 pages ?
A. 17 hrs
B. 19 hrs
C. 21 hrs
D. 23 hrs
Answer: Option C
Solution(By Examveda Team)
B's efficiency
= (A + B)'s efficiency - A's efficiency
= 5 - 3
= 2 pages/hour
B's time
2 pages in 1 hour
42 pages in 21 hours
This Question Belongs to Arithmetic Ability >> Time And Work
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