Harish and Bimal can complete a task in 20 days. They worked at it for 15 days and then Bimal left. The remaining work was done by Harish alone, in 10 days. Harish alone can complete the entire task in:
Let the total work be = 1 One day work done by Harish and Bimal = 1/20 Work done by Harish and Bimal in 15 days = 1/20 × 15 = 3/4 ⇒ Remaining work = 1 - 3/4 = 1/4 Harish did remaining work in 10 days alone. ⇒ One day work done by Harish = 1/4 ×1/10 = 1/40 ∴ Time taken by Harish to do the entire task alone = 1 ×40 = 40 days
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