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Ojha and Bali together can complete a work in 10 days. Ojha alone can complete it in 18 days. If Bali now does the work only for half a day daily, then in how many days Ojha and Bali together will complete the work?1). 13 days2). 11 days3). 12 days4). 10 days |
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Answer» Work DONE by Ojha in ONE day = 1/18 Work done by Ojha and BALI together in one day = 1/10 Work done by Bali in one day = (1/10) – (1/18) = 2/45 Work done by Bali in one day if he works for only half day = 2/(2×45) = 1/45 Work done by Ojha and Bali together if Bali works only for half a day daily in one day = (1/18) + (1/45) = 7/90 Time taken by Ojha and Bali to complete the work together when Bali works only for half a day = 1/(7/90) = 90/7 ≈ 13 days |
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