Question
‘A’ and ‘B’ can do a piece of work in 10 days
and 20 days, respectively. They started working together but ‘A’ left after 3 days. Find the time taken by ‘B’ to complete the remaining work.Solution
Let total amount of work be 20 units (LCM of 10 and 20). Efficiency of ‘A’ = 20/10 = 2 units/day Efficiency of ‘B’ = 20/20 = 1 units/day Amount of work done by ‘A’ and ‘B’ together in 3 days = (2 + 1) × 3 = 9 units Time taken by B to complete remaining work = {(20 – 9)/1} = 11 days
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