Solve this Time and Work question: Harish starts a task alone and works for 5 days. Jatin then joins, and the task is completed in 10 days from the start. If Harish alone takes 15 days, how many days would Jatin alone take?

The verified answer to “Solve this Time and Work question: Harish starts a task alone and works for 5 days. Jatin then joins, and the task is completed in 10 days from the start. If Harish alone takes 15 days, how many days would Jatin alone take?” is 15 days, option B. The question-specific working supplied with the item states: arish works throughout all 10 days and completes 10/15. Jatin works for 5 days and completes the remaining 0.33. Therefore Jatin's time = (5)/(0.33) = 15 days. This working identifies the relevant work-rate equation and connects the given information to the required result. After applying the verified rule, the required value or position is 15 days. The alternatives 16 days, 13 days and 14 days fail because each breaks at least one stated condition, transition, direction or arithmetic step. A plausible-looking option is not sufficient unless it reproduces the complete work-rate equation. This full replay leads only to 15 days, so option B is uniquely correct. The method is transparent, question-specific and suitable for SSC, Railway, Banking, Defence, State and other competitive examinations.