Let's assume that the total work is 60 units. Since Rajiv and Ramesh can together do the work in 15 days, their combined rate of work is 60/15 = 4 units per day. Since Ramesh alone can do the work in 20 days, his rate of work is 60/20 = 3 units per day. Therefore, Rajiv's rate of work is 4 - 3 = 1 unit per day. So, Rajiv alone can do the work in 60/1 = **60 days**.
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Verified answer
Answer: 60 days
Step-by-step explanation:
Let's assume that the total work is 60 units. Since Rajiv and Ramesh can together do the work in 15 days, their combined rate of work is 60/15 = 4 units per day. Since Ramesh alone can do the work in 20 days, his rate of work is 60/20 = 3 units per day. Therefore, Rajiv's rate of work is 4 - 3 = 1 unit per day. So, Rajiv alone can do the work in 60/1 = **60 days**.
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