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Saral, Ravi and Karan alone takes 10, 12 and 15 days respectively to complete the task. All of them started working together, but Saral left 2 days after the start of the work and Ravi left 3 days before the completion of the work. In how many days total work will be completed?

Saral, Ravi and Karan alone takes 10, 12 and 15 days respectively to complete the task. All of them started working together, but Saral left 2 days after the start of the work and Ravi left 3 days before the completion of the work. In how many days total work will be completed? Correct Answer 7

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In a school, a Science project has been assigned to three students Rajat, Rohan, and Bishal and it was told that they should work together on that project. Working alone Rohan can finish the project in 20 days, it is also given that if Rajat and Bishal work on the project they will take 9 days to complete the project. Bishal alone can complete the project in 15 days. Rohan started working on the project from Monday but after 8 days he left and after that Rajat and Bishal started working on it but Bishal also left 6 days before completion of the work and Rajat completed the remaining project, in how many days will the project be completed and on which day will it be completed?
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