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QA – Placement Quizzes | Work and Wages | Question 1

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Two friends A and B were employed to do a work. Initial deadline was fixed at 24 days. Both started working together but after 20 days, A left the work and the whole work took 30 days to complete. In how much time can B alone can do the work? (A) 40 (B) 50 (C) 60 (D) 70

Answer: (C)

Explanation: Let the total work be 24 units. It is given that A and B together can do the work in 24 days. => Combined efficiency of A and B = 24/24 = 1 unit / day => Work done in 20 days = 20 units => Work left = 24 – 20 = 4 units Now, this remaining 4 units of work was done by B alone in 10 days. => Efficiency of B = 4/10 = 0.4 Therefore, time required by B alone to do the work = 24/0.4 = 60 days

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Last Updated : 28 Jun, 2021
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