Sudarshan can copy 50 pages in 10 hours; Sudarshan and Prakash together can copy 300 pages in 40 hours. In how much time can Prakash copy 25 pages?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 10 hours.
Sudarshan's rate = 50/10 = 5 pages/hr
Sudarshan and Prakash's rate = 400/30 = 7.5 pages/hr
Prakash's rate = 7.5 – 5 = 2.5 pages/hr
Time for 25 pages = 25/2.5 = 10 hours