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Mathematics, 26.09.2019 13:20 rafi10

Each of a, b and c need a certain unique time to do a certain work. c needs 1 hour less than a to complete the work. working together, they require 30 minutes to complete 50% of the job. the work also gets completed if a and b start working together and a leaves after 1 hour and b works for a further 3 hours. how much work does c do per hour?

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