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Rahul and Shyam, working together, can do a piece of work in 5 hours; Rahul alone can do the same work in 15 hours. How
much time will Shyam alone take to do that work?
12 hours
8.5 hours
7.5 hours
15 hours
- Rahul and Shyam together finish work in 5 hours.
- Rahul alone finishes the same work in 15 hours.
- To find Shyam's time alone, we calculate the work rates:
- Rahul's work rate: 1/15 of the work per hour.
- Together, their work rate is 1/5 of the work per hour.
- Shyam's work rate is the difference: (1/5 - 1/15) = 2/15 of the work per hour.
- The time Shyam takes to complete the work alone is the reciprocal of his work rate, which is 15/2 = 7.5 hours.
- Correct Answer: Option 3: 7.5 hours
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