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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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