Aarti can type 85 pages in 10 hours. Aarti and Bina together can type 500 pages in 40 hours. How much time will Bina take to type 40 pages?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 10 hours.
Aarti's typing speed = 85/10 = 8.5 pages/hour
Aarti and Beena's combined typing speed = 500/40 = 12.5 pages/hour
Beena's typing speed = 12.5 - 8.5 = 4 pages/hour
Time required = 40/4 = 10 hours.