Question

Anu can type 40 pages of a book in 10 hours. Anu and Mohit together can type 270 pages in 54 hours. In what time (in hours) can Mohit alone type 20 pages?

• A. 10
• B. 20
• C. 30
• D. 40

Answer 1

Answer:

B. 20

Solution: Given: Anu can type 40 pages in 10 hours Anu and Mohit together can type 270 pages in 54 hours Formula Used: Total Work = Efficiency × Time Calculation: According to the question, Efficiency of Anu = 40/10 = 4 pages/hour Efficiency of Anu and Mohit = 270/54 = 5 pages/hour ⇒ Efficiency of Mohit = 5 - 4 = 1 page/hour For 20 pages, time taken by Mohit = 20/1 = 20 hours ∴ Mohit can type 20 pages in 20 hours.