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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?

1. 10 hours
2. 12 hours
3. 15 hours
4. 8 hours

Correct answer: 10 hours

Solution

Sudarshan’s rate is 50/10 = 5 pages per hour. Together they copy 300/40 = 7.5 pages per hour, so Prakash’s rate is 2.5 pages per hour. To copy 25 pages, Prakash needs 25/2.5 = 10 hours.

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